Webster's Dictionary, 1913

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Acrophony noun [ Greek 'a`kros extreme + ... sound.] The use of a picture symbol of an object to represent phonetically the initial sound of the name of the object.

Acropodium noun [ Greek 'a`kros topmost + poy`s , podo`s , foot.] (Zoology) The entire upper surface of the foot.

Acropolis noun [ Greek 'akro`polis ; 'a`kros extreme + po`lis city.] The upper part, or the citadel, of a Grecian city; especially, the citadel of Athens.

Acropolitan adjective Pertaining to an acropolis.

Acrospire noun [ Greek ... + ... anything twisted.] (Botany) The sprout at the end of a seed when it begins to germinate; the plumule in germination; -- so called from its spiral form.

Acrospire intransitive verb To put forth the first sprout.

Acrospore noun [ Greek ... + ... fruit.] (Botany) A spore borne at the extremity of the cells of fructification in fungi.

Acrosporous adjective Having acrospores.

Across (#; 115) preposition [ Prefix a- + cross : confer French en croix . See Cross, noun ] From side to side; athwart; crosswise, or in a direction opposed to the length; quite over; as, a bridge laid across a river. Dryden.

To come across , to come upon or meet incidentally. Freeman. -- To go across the country , to go by a direct course across a region without following the roads.

Across adverb
1. From side to side; crosswise; as, with arms folded across . Shak.

2. Obliquely; athwart; amiss; awry. [ Obsolete]

The squint-eyed Pharisees look across at all the actions of Christ.
Bp. Hall.

Acrostic noun [ Greek ...; ... extreme + ... order, line, verse.]
1. A composition, usually in verse, in which the first or the last letters of the lines, or certain other letters, taken in order, form a name, word, phrase, or motto.

2. A Hebrew poem in which the lines or stanzas begin with the letters of the alphabet in regular order (as Psalm cxix.). See Abecedarian .

Double acrostic , a species of enigma, in which words are to be guessed whose initial and final letters form other words.

Acrostic, Acrostical noun Pertaining to, or characterized by, acrostics.

Acrostically adverb After the manner of an acrostic.

Acrotarsium noun [ New Latin , from Greek ... topmost + ... tarsus.] (Zoology) The instep or front of the tarsus.

Acroteleutic (ăk`ro*te*lū"tĭk) noun [ Greek 'a`kros extreme + teley`th end.] (Eccles.) The end of a verse or psalm, or something added thereto, to be sung by the people, by way of a response.

Acroter (ăk`ro*tẽr or ȧ*krō*tẽr) noun [ French acrotère . See Acroterium .] (Architecture) Same as Acroterium .

Acroterial (ăk`ro*tē"rĭ* a l) adjective Pertaining to an acroterium; as, acroterial ornaments. P. Cyc.

Acroterium (-ŭm) noun ; plural Acroteria [ Latin , from Greek 'akrwth`rion summit, from 'a`kros topmost.] (Architecture) (a) One of the small pedestals, for statues or other ornaments, placed on the apex and at the basal angles of a pediment. Acroteria are also sometimes placed upon the gables in Gothic architecture. J. H. Parker. (b) One of the pedestals, for vases or statues, forming a part roof balustrade.

Acrotic adjective [ Greek ... an extreme, from ....] (Medicine) Pertaining to or affecting the surface.

Acrotism (ăk"ro*tĭz'm) noun [ Greek 'a priv. + kro`tos a rattling, beating.] (Medicine) Lack or defect of pulsation.

Acrotomous adjective [ Greek 'akro`tomos cut off sharp; 'a`kros extreme + te`mnein to cut.] (Min.) Having a cleavage parallel with the base.

Acrylic adjective (Chemistry) Of or containing acryl , the hypothetical radical of which acrolein is the hydride; as, acrylic acid.

Act (ăkt) noun [ Latin actus , from agere to drive, do: confer French acte . See Agent .]
1. That which is done or doing; the exercise of power, or the effect, of which power exerted is the cause; a performance; a deed.

That best portion of a good man's life,
His little, nameless, unremembered acts
Of kindness and of love.

Hence, in specific uses: (a) The result of public deliberation; the decision or determination of a legislative body, council, court of justice, etc.; a decree, edit, law, judgment, resolve, award; as, an act of Parliament, or of Congress. (b) A formal solemn writing, expressing that something has been done. Abbott. (c) A performance of part of a play; one of the principal divisions of a play or dramatic work in which a certain definite part of the action is completed. (d) A thesis maintained in public, in some English universities, by a candidate for a degree, or to show the proficiency of a student.

2. A state of reality or real existence as opposed to a possibility or possible existence. [ Obsolete]

The seeds of plants are not at first in act , but in possibility, what they afterward grow to be.

3. Process of doing; action. In act , in the very doing; on the point of (doing). " In act to shoot." Dryden.

This woman was taken . . . in the very act .
John viii. 4.

Act of attainder . (Law) See Attainder . -- Act of bankruptcy (Law) , an act of a debtor which renders him liable to be adjudged a bankrupt. -- Act of faith . (Ch. Hist.) See Auto-da-Fé . -- Act of God (Law) , an inevitable accident; such extraordinary interruption of the usual course of events as is not to be looked for in advance, and against which ordinary prudence could not guard. -- Act of grace , an expression often used to designate an act declaring pardon or amnesty to numerous offenders, as at the beginning of a new reign. -- Act of indemnity , a statute passed for the protection of those who have committed some illegal act subjecting them to penalties. Abbott. -- Act in pais , a thing done out of court (anciently, in the country ), and not a matter of record.

Syn. -- See Action .

Act transitive verb [ imperfect & past participle Acted ; present participle & verbal noun Acting .] [ Latin actus , past participle of agere to drive, lead, do; but influenced by English act , noun ]
1. To move to action; to actuate; to animate. [ Obsolete]

Self-love, the spring of motion, acts the soul.

2. To perform; to execute; to do. [ Archaic]

That we act our temporal affairs with a desire no greater than our necessity.
Jer. Taylor.

Industry doth beget by producing good habits, and facility of acting things expedient for us to do.

Uplifted hands that at convenient times
Could act extortion and the worst of crimes.

3. To perform, as an actor; to represent dramatically on the stage.

4. To assume the office or character of; to play; to personate; as, to act the hero.

5. To feign or counterfeit; to simulate.

With acted fear the villain thus pursued.

To act a part , to sustain the part of one of the characters in a play; hence, to simulate; to dissemble. -- To act the part of , to take the character of; to fulfill the duties of.

Act intransitive verb
1. To exert power; to produce an effect; as, the stomach acts upon food.

2. To perform actions; to fulfill functions; to put forth energy; to move, as opposed to remaining at rest; to carry into effect a determination of the will.

He hangs between, in doubt to act or rest.

3. To behave or conduct, as in morals, private duties, or public offices; to bear or deport one's self; as, we know not why he has acted so.

4. To perform on the stage; to represent a character.

To show the world how Garrick did not act .

To act as or for , to do the work of; to serve as. -- To act on , to regulate one's conduct according to. -- To act up to , to equal in action; to fulfill in practice; as, he has acted up to his engagement or his advantages.

Actable adjective Capable of being acted. Tennyson.

Actinal adjective [ Greek ..., ..., ray.] (Zoology) Pertaining to the part of a radiate animal which contains the mouth. Latin Agassiz.

Actinaria noun plural [ New Latin , from Greek ..., ..., ray.] (Zoology) A large division of Anthozoa, including those which have simple tentacles and do not form stony corals. Sometimes, in a wider sense, applied to all the Anthozoa, expert the Alcyonaria, whether forming corals or not.

Acting adjective
1. Operating in any way.

2. Doing duty for another; officiating; as, an acting superintendent.

Actinia noun ; plural Latin Actiniæ English Actinias [ Latinized from Greek ..., ..., ray.] (Zoology) (a) An animal of the class Anthozoa, and family Actinidæ . From a resemblance to flowers in form and color, they are often called animal flowers and sea anemones . [ See Polyp .]. (b) A genus in the family Actinidæ .

Actinic adjective Of or pertaining to actinism; as, actinic rays.

Actiniform adjective [ Greek ..., ..., ray + -form .] Having a radiated form, like a sea anemone.

Actinism noun [ Greek ..., ... ray.] The property of radiant energy (found chiefly in solar or electric light) by which chemical changes are produced, as in photography.

Actinium noun [ Greek ..., ..., ray.] (Chemistry) A supposed metal, said by Phipson to be contained in commercial zinc; -- so called because certain of its compounds are darkened by exposure to light.

Actino-chemistry noun Chemistry in its relations to actinism. Draper.

Actinogram noun [ Greek ..., ..., ray + -gram .] A record made by the actinograph.

Actinograph noun [ Greek ..., ..., ray + -graph .] An instrument for measuring and recording the variations in the actinic or chemical force of rays of light. Nichol.

Actinoid adjective [ Greek ..., ..., ray + -oid .] Having the form of rays; radiated, as an actinia.

Actinolite noun [ Greek ..., ..., ray + -lite .] (Min.) A bright green variety of amphibole occurring usually in fibrous or columnar masses.

Actinolitic adjective (Min.) Of the nature of, or containing, actinolite.

Actinology noun [ Greek ..., ..., ray + -logy .] The science which treats of rays of light, especially of the actinic or chemical rays.

Actinomere noun [ Greek ..., ..., ray + ... part.] (Zoology) One of the radial segments composing the body of one of the Cœlenterata.

Actinometer noun [ Greek ..., ..., ray + -meter ] (a) An instrument for measuring the direct heating power of the sun's rays. (b) An instrument for measuring the actinic effect of rays of light.

Actinometric adjective Pertaining to the measurement of the intensity of the solar rays, either (a) heating, or (b) actinic.

Actinometry noun
1. The measurement of the force of solar radiation. Maury.

2. The measurement of the chemical or actinic energy of light. Abney.

Actinomycosis noun [ New Latin ] (Medicine) A chronic infectious disease of cattle and man due to the presence of Actinomyces bovis . It causes local suppurating tumors, esp. about the jaw. Called also lumpy jaw or big jaw . -- Ac`ti*no*my*cot"ic adjective

Actinophone noun [ Greek ..., ..., ray + ... voice.] (Physics) An apparatus for the production of sound by the action of the actinic, or ultraviolet, rays.

Actinophonic adjective (Physics) Pertaining to, or causing the production of, sound by means of the actinic, or ultraviolet, rays; as, actinophonic phenomena.

Actinophorous adjective [ Greek ..., ..., ray + ... to bear.] Having straight projecting spines.

Actinosome noun [ Greek ... ray + ... body.] (Zoology) The entire body of a cœlenterate.