Webster's Dictionary, 1913

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Arithmetician noun [ Confer French arithméticien .] One skilled in arithmetic.

Arithmomancy noun Arithmancy.

Arithmometer noun [ Greek ... number + -meter : confer French arithmomètre .] A calculating machine.

Ark noun [ Middle English ark , arke , arche , Anglo-Saxon arc , earc , earce , from Latin arca , from arcere to inclose, keep off; akin to Greek ... to keep off.]
1. A chest, or coffer. [ Obsolete]

Bearing that precious relic in an ark .
Spenser.

2. (Jewish Hist.) The oblong chest of acacia wood, overlaid with gold, which supported the mercy seat with its golden cherubs, and occupied the most sacred place in the sanctuary. In it Moses placed the two tables of stone containing the ten commandments. Called also the Ark of the Covenant .

3. The large, chestlike vessel in which Noah and his family were preserved during the Deluge. Gen. vi. Hence: Any place of refuge.

4. A large flatboat used on Western American rivers to transport produce to market.

Ark shell (Zoology) A marine bivalve shell belonging to the genus Arca and its allies.

Arkite adjective Belonging to the ark. [ R.] Faber.

Arkose noun [ F] (Petrog) A sandstone derived from the disintegration of granite or gneiss, and characterized by feldspar fragments. -- Ar*kos"ic adjective

Arles noun plural [ Confer French arrhes , Scot. airles . Confer Earles penny .] An earnest; earnest money; money paid to bind a bargain. [ Scot.]

Arles penny , earnest money given to servants. Kersey.

Arm noun [ Anglo-Saxon arm , earm ; akin to Old High German aram , G., D., Dan., & Swedish arm , Icelandic armr , Goth. arms , Latin armus arm, shoulder, and probably to Greek ... joining, joint, shoulder, from the root ... to join, to fit together; confer Slav. rame . .... See Art , Article .]
1. The limb of the human body which extends from the shoulder to the hand; also, the corresponding limb of a monkey.

2. Anything resembling an arm ; as, (a) The fore limb of an animal, as of a bear. (b) A limb, or locomotive or prehensile organ, of an invertebrate animal. (c) A branch of a tree. (d) A slender part of an instrument or machine, projecting from a trunk, axis, or fulcrum; as, the arm of a steelyard. (e) (Naut) The end of a yard; also, the part of an anchor which ends in the fluke. (f) An inlet of water from the sea. (g) A support for the elbow, at the side of a chair, the end of a sofa, etc.

3. Fig.: Power; might; strength; support; as, the secular arm ; the arm of the law.

To whom is the arm of the Lord revealed?
Isa. lii. 1.

Arm's end , the end of the arm; a good distance off. Dryden. -- Arm's length , the length of the arm. -- Arm's reach , reach of the arm; the distance the arm can reach. -- To go (or walk ) arm in arm , to go with the arm or hand of one linked in the arm of another. "When arm in arm we went along." Tennyson. -- To keep at arm's length , to keep at a distance (literally or figuratively); not to allow to come into close contact or familiar intercourse. -- To work at arm's length , to work disadvantageously.

Arm noun [ See Arms .] (Mil.) (a) A branch of the military service; as, the cavalry arm was made efficient. (b) A weapon of offense or defense; an instrument of warfare; -- commonly in the plural

Arm transitive verb [ imperfect & past participle Armed ; present participle & verbal noun Arming .] [ Middle English armen , French armer , from Latin armare , from arma , plural, arms. See arms .]
1. To take by the arm; to take up in one's arms. [ Obsolete]

And make him with our pikes and partisans
A grave: come, arm him.
Shak.

Arm your prize;
I know you will not lose him.
Two N. Kins.

2. To furnish with arms or limbs. [ R.]

His shoulders broad and strong,
Armed long and round.
Beau. & Fl.

3. To furnish or equip with weapons of offense or defense; as, to arm soldiers; to arm the country.

Abram . . . armed his trained servants.
Gen. xiv. 14.

4. To cover or furnish with a plate, or with whatever will add strength, force, security, or efficiency; as, to arm the hit of a sword; to arm a hook in angling.

5. Fig.: To furnish with means of defense; to prepare for resistance; to fortify, in a moral sense.

Arm yourselves . . . with the same mind.
1 Pet. iv. 1.

To arm a magnet , to fit it with an armature.

Arm intransitive verb To provide one's self with arms, weapons, or means of attack or resistance; to take arms. " 'Tis time to arm ." Shak.

Arm-gret adjective Great as a man's arm. [ Obsolete]

A wreath of gold, arm-gret .
Chaucer.

Armada (är*mā"dȧ or är*mä"dȧ) noun [ Spanish armada , Latin as if armata (sc. classic fleet), from armatus , past participle of armare . See Arm , transitive verb Army .] A fleet of armed ships; a squadron. Specifically, the Spanish fleet which was sent to assail England, a.d. 1558.

Armadillo (är`mȧ*dĭl"lo) noun ; plural Armadillos (-lōz). [ Spanish armadillo , dim. of armado armed, past participle of armar to arm. So called from being armed with a bony shell.] (Zoology) (a) Any edentate animal if the family Dasypidæ , peculiar to America. The body and head are incased in an armor composed of small bony plates. The armadillos burrow in the earth, seldom going abroad except at night. When attacked, they curl up into a ball, presenting the armor on all sides. Their flesh is good food. There are several species, one of which (the peba) is found as far north as Texas. See Peba , Poyou , Tatouay . (b) A genus of small isopod Crustacea that can roll themselves into a ball.

Armado (är*mā"do) noun Armada. [ Obsolete]

Armament noun [ Latin armamenta , plural, utensils, esp. the tackle of a ship, from armare to arm: confer Late Latin armamentum , French armement .]
1. A body of forces equipped for war; -- used of a land or naval force. "The whole united armament of Greece." Glover.

2. (Mil. & Nav.) All the cannon and small arms collectively, with their equipments, belonging to a ship or a fortification.

3. Any equipment for resistance.

Armamentary noun [ Latin armamentarium , from armamentum : confer French armamentaire .] An armory; a magazine or arsenal. [ R.]

Armature noun [ Latin armatura , from armare to arm: confer French armature . See Arm , transitive verb , Armor .]
1. Armor; whatever is worn or used for the protection and defense of the body, esp. the protective outfit of some animals and plants.

2. (Magnetism) A piece of soft iron used to connect the two poles of a magnet, or electro-magnet, in order to complete the circuit, or to receive and apply the magnetic force. In the ordinary horseshoe magnet, it serves to prevent the dissipation of the magnetic force.

3. (Architecture) Iron bars or framing employed for the consolidation of a building, as in sustaining slender columns, holding up canopies, etc. Oxf. Gloss.

Armature noun (Electricity) That part of a dynamo or electric generator or of an electric motor in which a current is induced by a relatively moving magnetic field. The armature usually consists of a series of coils or groups of insulated conductors surrounding a core of iron.

Armchair noun A chair with arms to support the elbows or forearms. Tennyson.

Armed adjective
1. Furnished with weapons of offense or defense; furnished with the means of security or protection. "And armed host." Dryden.

2. Furnished with whatever serves to add strength, force, or efficiency.

A distemper eminently armed from heaven.
De Foe.

3. (Her.) Having horns, beak, talons, etc; - - said of beasts and birds of prey.

Armed at all points (Blazoning) , completely incased in armor, sometimes described as armed cap-à- pie . Cussans. -- Armed en flute . (Nautical) See under Flute . -- Armed magnet , a magnet provided with an armature. -- Armed neutrality . See under Neutrality .

Armenian adjective [ Confer French Arménien , Latin Armenias , from Armenia .] Of or pertaining to Armenia.

Armenian bole , a soft clayey earth of a bright red color found in Armenia, Tuscany, etc. -- Armenian stone . (a) The commercial name of lapis lazuli. (b) Emery.

Armenian noun
1. A native or one of the people of Armenia; also, the language of the Armenians.

2. (Eccl. Hist.) An adherent of the Armenian Church, an organization similar in some doctrines and practices to the Greek Church, in others to the Roman Catholic.

Armet noun [ French, dim. of arme arm, or corrupted for healmet helmet.] A kind of helmet worn in the 14th, 15th, and 16th centuries.

Armful noun ; plural Armfulus As much as the arm can hold.

Armgaunt adjective With gaunt or slender legs. "An armgaunt steed." Shak.

» This word is peculiar to Shakespeare. Its meaning has not yet been satisfactorily explained.

Armhole noun [ Arm + hole .]
1. The cavity under the shoulder; the armpit. Bacon.

2. A hole for the arm in a garment.

Armiferous adjective [ Latin armifer ; arma arms + ferre to bear.] Bearing arms or weapons. [ R.]

Armiger noun [ Latin armiger armor bearer; arma arms + gerere to bear.] Formerly, an armor bearer, as of a knight, an esquire who bore his shield and rendered other services. In later use, one next in degree to a knight, and entitled to armorial bearings. The term is now superseded by esquire . Jacob.

Armigerous adjective Bearing arms. [ R.]

They belonged to the armigerous part of the population, and were entitled to write themselves Esquire.
De Quincey.

Armil noun [ Latin armilla a bracelet, from armus arm: confer Old French armille .]
1. A bracelet. [ Obsolete]

2. An ancient astronomical instrument.

» When composed of one ring placed in the plane of the equator for determining the time of the equinoxes, it is called an equinoctial armil ; when of two or more rings, one in the plane of the meridian, for observing the solstices, it is called a solstitial armil . Whewell.

Armilla noun ; plural English Armillas Latin Armillæ [ Latin , a bracelet.]
1. An armil.

2. (Zoology) A ring of hair or feathers on the legs.

Armillary adjective [ Late Latin armillarius , from Latin armilla arm ring, bracelet, from armus arm: confer French armillaire . See Arm , noun ] Pertaining to, or resembling, a bracelet or ring; consisting of rings or circles.

Armillary sphere , an ancient astronomical machine composed of an assemblage of rings, all circles of the same sphere, designed to represent the positions of the important circles of the celestial sphere. Nichol.

Arming noun
1. The act of furnishing with, or taking, arms.

The arming was now universal.
Macaulay.

2. (Nautical) A piece of tallow placed in a cavity at the lower end of a sounding lead, to bring up the sand, shells, etc., of the sea bottom. Totten.

3. plural (Nautical) Red dress cloths formerly hung fore and aft outside of a ship's upper works on holidays.

Arming press (Bookbinding) , a press for stamping titles and designs on the covers of books.

Arminian adjective Of or pertaining to Arminius of his followers, or to their doctrines. See note under Arminian , noun

Arminian noun (Eccl. Hist.) One who holds the tenets of Arminius, a Dutch divine (b. 1560, d. 1609).

The Arminian doctrines are: 1. Conditional election and reprobation, in opposition to absolute predestination. 2. Universal redemption, or that the atonement was made by Christ for all mankind, though none but believers can be partakers of the benefit. 3. That man, in order to exercise true faith, must be regenerated and renewed by the operation of the Holy Spirit, which is the gift of God. 4. That man may resist divine grace. 5. That man may relapse from a state of grace.

Arminianism noun The religious doctrines or tenets of the Arminians.

Armipotence noun [ Latin armipotentia , from armipotents .] Power in arms. [ R.] Johnson.

Armipotent adjective [ Latin armipotents ; arma arms + potens powerful, present participle of posse to be able.] Powerful in arms; mighty in battle.

The temple stood of Mars armipotent .
Dryden.

Armisonant, Armisonous adjective [ Latin armisonus ; arma arms + sonare (present participle sonans ) to sound.] Rustling in arms; resounding with arms. [ Obsolete]

Armistice noun [ French armistice , from (an assumed word) Latin armistitium ; arma arms + stare , statum (combining form, -stitum ), to stand still.] A cessation of arms for a short time, by convention; a temporary suspension of hostilities by agreement; a truce.

Armless adjective
1. Without any arm or branch.

2. Destitute of arms or weapons.

Armlet noun [ Arm + -let .]
1. A small arm; as, an armlet of the sea. Johnson.

2. An arm ring; a bracelet for the upper arm.

3. Armor for the arm.

Armoniac adjective Ammoniac. [ Obsolete]

Armor noun [ Middle English armure , from French armure , Old French armeure , from Latin armatura . See Armature .] [ Spelt also armour .]
1. Defensive arms for the body; any clothing or covering worn to protect one's person in battle.

» In English statues, armor is used for the whole apparatus of war, including offensive as well as defensive arms. The statues of armor directed what arms every man should provide.

2. Steel or iron covering, whether of ships or forts, protecting them from the fire of artillery.

Coat armor , the escutcheon of a person or family, with its several charges and other furniture, as mantling, crest, supporters, motto, etc. -- Submarine , a water- tight dress or covering for a diver. See under Submarine .

Armor-bearer noun One who carries the armor or arms of another; an armiger. Judg. ix. 54.

Armored adjective Clad with armor.

Armored cruiser (Nav.) A man-of-war carrying a large coal supply, and more or less protected from the enemy's shot by iron or steel armor. There is no distinct and accepted classification distinguishing armored and protected cruisers from each other, except that the first have more or heavier armor than the second.

Armorer noun [ Middle English armurer , armerer , from French armurter , from armure armor.]
1. One who makes or repairs armor or arms.

2. Formerly, one who had care of the arms and armor of a knight, and who dressed him in armor. Shak.

3. One who has the care of arms and armor, cleans or repairs them, etc.