Atokous At"o·kous adjective [ Greek ... barren; 'a priv. + ... offspring.] (Zoology) Producing only asexual individuals, as the eggs of certain annelids.

Atole A·to"le noun [ Mex. Spanish ] A porridge or gruel of maize meal and water, milk, or the like. [ Spanish Amer.]

Atoll A·toll" noun [ The native name in the Indian Ocean.] A coral island or islands, consisting of a belt of coral reef, partly submerged, surrounding a central lagoon or depression; a lagoon island.

Atom At"om noun [ Latin atomus , Greek ..., uncut, indivisible; 'a priv. + ..., verbal adj. of ... to cut: confer French atome . See Tome .] 1. (Physics) (a) An ultimate indivisible particle of matter. (b) An ultimate particle of matter not necessarily indivisible; a molecule. (c) A constituent particle of matter, or a molecule supposed to be made up of subordinate particles.

» These three definitions correspond to different views of the nature of the ultimate particles of matter. In the case of the last two, the particles are more correctly called molecules . Dana.

2. (Chemistry) The smallest particle of matter that can enter into combination; one of the elementary constituents of a molecule.

3. Anything extremely small; a particle; a whit.

There was not an atom of water.
Sir J. Ross.

Atom At"om transitive verb To reduce to atoms. [ Obsolete] Feltham.

Atomic, Atomical A·tom"ic, A·tom"ic·al adjective [ Confer French atomique .] 1. Of or pertaining to atoms.

2. Extremely minute; tiny.

Atomic philosophy , or Doctrine of atoms , a system which, assuming that atoms are endued with gravity and motion, accounted thus for the origin and formation of all things. This philosophy was first broached by Leucippus, was developed by Democritus, and afterward improved by Epicurus, and hence is sometimes denominated the Epicurean philosophy. -- Atomic theory , or the Doctrine of definite proportions (Chemistry) , teaches that chemical combinations take place between the supposed ultimate particles or atoms of bodies, in some simple ratio, as of one to one, two to three, or some other, always expressible in whole numbers. -- Atomic weight (Chemistry) , the weight of the atom of an element as compared with the weight of the atom of hydrogen, taken as a standard.

Atomically A·tom"ic·al·ly adverb In an atomic manner; in accordance with the atomic philosophy.

Atomician At`o·mi"cian noun An atomist. [ R.]

Atomicism A·tom"i·cism noun Atomism. [ Obsolete]

Atomicity At`o·mic"i·ty noun [ Confer French atomicité .] (Chemistry) Degree of atomic attraction; equivalence; valence; also (a later use) the number of atoms in an elementary molecule. See Valence .

Atomism At"om·ism noun [ Confer French atomisme .] The doctrine of atoms. See Atomic philosophy , under Atomic .

Atomist At"om·ist noun [ Confer French atomiste .] One who holds to the atomic philosophy or theory. Locke.

Atomistic At`om·is"tic adjective Of or pertaining to atoms; relating to atomism. [ R.]

It is the object of the mechanical atomistic philosophy to confound synthesis with synartesis.
Coleridge.

Atomization At`om·i·za"tion noun 1. The act of reducing to atoms, or very minute particles; or the state of being so reduced.

2. (Medicine) The reduction of fluids into fine spray.

Atomize At"om·ize transitive verb To reduce to atoms, or to fine spray.

The liquids in the form of spray are said to be pulverized, nebulized, or atomized .
Dunglison.

Atomizer At"om·i`zer (ăt"ŭm*ī`zẽr) noun One who, or that which, atomizes; esp., an instrument for reducing a liquid to spray for disinfecting, cooling, or perfuming.

Atomology At`om·ol"o·gy (ăt`ŭm*ŏl"o*jȳ) noun [ Atom + -logy .] The doctrine of atoms. Cudworth.

Atomy At"om·y (ăt"ŭm*ȳ) noun An atom; a mite; a pigmy.

Atomy At"o·my noun [ For anatomy , taken as an atomy .] A skeleton. [ Ludicrous] Shak.

Atonable A·ton"a·ble adjective Admitting an atonement; capable of being atoned for; expiable.

Atone A·tone" (ȧ*tōn") intransitive verb [ imperfect & past participle Atoned ; present participle & verbal noun Atoning .] [ From at one , , i. e., to be, or cause to be, at one. See At one .] 1. To agree; to be in accordance; to accord. [ Obsolete]

He and Aufidius can no more atone
Than violentest contrariety.
Shak.

2. To stand as an equivalent; to make reparation, compensation, or amends, for an offense or a crime.

The murderer fell, and blood atoned for blood.
Pope.

The ministry not atoning for their former conduct by any wise or popular measure.
Junius.

Atone A·tone" transitive verb 1. To set at one; to reduce to concord; to reconcile, as parties at variance; to appease. [ Obsolete]

I would do much
To atone them, for the love I bear to Cassio.
Shak.

2. To unite in making. [ Obsolete & R.]

The four elements . . . have atoned
A noble league.
Ford.

3. To make satisfaction for; to expiate.

Or each atone his guilty love with life.
Pope.

Atonement A·tone"ment noun 1. (Literally, a setting at one .) Reconciliation; restoration of friendly relations; agreement; concord. [ Archaic]

By whom we have now received the atonement .
Rom. v. 11.

He desires to make atonement
Betwixt the Duke of Gloucester and your brothers.
Shak.

2. Satisfaction or reparation made by giving an equivalent for an injury, or by doing of suffering that which will be received in satisfaction for an offense or injury; expiation; amends; -- with for . Specifically, in theology: The expiation of sin made by the obedience, personal suffering, and death of Christ.

When a man has been guilty of any vice, the best atonement be can make for it is, to warn others.
Spectator.

The Phocians behaved with, so much gallantry, that they were thought to have made a sufficient atonement for their former offense.
Potter.

Atonement A·tone"ment noun -- Day of Atonement (Jewish Antiq.) , the only fast day of the Mosaic ritual, celebrated on the tenth day of the seventh month (Tisri), according to the rites described in Leviticus xvi.

Atoner A·ton"er noun One who makes atonement.

Atones At·ones adverb [ See At one .] [ Obsolete]

Down he fell atones as a stone.
Chaucer.

Atonic A·ton"ic adjective [ Confer French atonique . See Atony .] 1. (Medicine) Characterized by atony, or want of vital energy; as, an atonic disease.

2. (Gram.) Unaccented; as, an atonic syllable.

3. Destitute of tone vocality; surd. Rush.

Atonic A·ton"ic noun 1. (Gram.) A word that has no accent.

2. An element of speech entirely destitute of vocality, or produced by the breath alone; a nonvocal or surd consonant; a breathing. Rush.

3. (Medicine) A remedy capable of allaying organic excitement or irritation. Dunglison.

Atony At"o·ny noun [ Greek ... slackness; 'a priv. + ... tone, strength, ... to stretch: confer French atonie .] (Medicine) Want of tone; weakness of the system, or of any organ, especially of such as are contractile.

Atop A·top" adverb On or at the top. Milton.

Atrabilarian At`ra·bi·la"ri·an noun A person much given to melancholy; a hypochondriac. I. Disraeli.

Atrabilarian, Atrabilarious At`ra·bi·la"ri·an, At`ra·bi·la"ri·ous adjective [ Late Latin atrabilarius , from Latin atra bilis black bile: confer French atrabilaire , from atrabile .] Affected with melancholy; atrabilious. Arbuthnot.

Atrabiliar At`ra·bil"iar adjective Melancholy; atrabilious.

Atrabiliary At`ra·bil"ia·ry adjective 1. Of or pertaining to atra bilis or black bile, a fluid formerly supposed to be produced by the kidneys.

2. Melancholic or hypohondriac; atrabilious; -- from the supposed predominance of black bile, to the influence of which the ancients attributed hypochondria, melancholy, and mania.

Atrabiliary arteries , capsules , and veins (Anat.) , those pertaining to the kidney; -- called also renal arteries, capsules, and veins.

Atrabilious At`ra·bil"ious adjective Melancholic or hypochondriac; atrabiliary. Dunglision.

A hard-faced, atrabilious , earnest-eyed race.
Lowell.

He was constitutionally atrabilious and scornful.
Froude.

Atramentaceous At`ra·men·ta"ceous adjective [ Latin atramentum ink, from ater black.] Black, like ink; inky; atramental. [ Obsolete] Derham.

Atramental, Atramentous At`ra·men"tal, At`ra·men"tous adjective Of or pertaining to ink; inky; black, like ink; as, atramental galls; atramentous spots.

Atramentarious At`ra·men·ta"ri·ous adjective [ Confer French atramentaire . See Atramentaceous .] Like ink; suitable for making ink. Sulphate of iron (copperas, green vitriol) is called atramentarious , as being used in making ink.

Atrede At·rede transitive verb [ Middle English at (AS. æt ) out + rede .] To surpass in council. [ Obsolete]

Men may the olde atrenne, but hat atrede .
Chaucer.

Atrenne At·renne" transitive verb [ Middle English at + renne to run.] To outrun. [ Obsolete] Chaucer.

Atresia A·tre"si·a noun [ New Latin , from Greek ... not perforated.] (Medicine) Absence or closure of a natural passage or channel of the body; imperforation.

Atrial A"tri·al adjective Of or pertaining to an atrium.

Atrip A·trip" adverb [ Prefix a- + trip .] (Nautical) (a) Just hove clear of the ground; -- said of the anchor. (b) Sheeted home, hoisted taut up and ready for trimming; -- said of sails. (c) Hoisted up and ready to be swayed across; -- said of yards.

Atrium A"tri·um noun ; plural Atria [ Latin , the fore court of a Roman house.] 1. (Architecture) (a) A square hall lighted from above, into which rooms open at one or more levels. (b) An open court with a porch or gallery around three or more sides; especially at the entrance of a basilica or other church. The name was extended in the Middle Ages to the open churchyard or cemetery.

2. (Anat.) The main part of either auricle of the heart as distinct from the auricular appendix. Also, the whole articular portion of the heart.

3. (Zoology) A cavity in ascidians into which the intestine and generative ducts open, and which also receives the water from the gills. See Ascidioidea .

Atrium A"tri·um noun (Anat.) A cavity, entrance, or passage; as, the atrium , or atrial cavity, in the body wall of the amphioxus; an atrium of the infundibula of the lungs, etc.

Atrocha At`ro·cha noun [ New Latin , from Greek 'a priv. + ... a circle.] (Zoology) A kind of chætopod larva in which no circles of cilia are developed.

Atrocious A·tro"cious adjective [ Latin atrox , atrocis , cruel, fierce: confer French atroce .] 1. Extremely heinous; full of enormous wickedness; as, atrocious quilt or deeds.

2. Characterized by, or expressing, great atrocity.

Revelations . . . so atrocious that nothing in history approaches them.
De Quincey.

3. Very grievous or violent; terrible; as, atrocious distempers. [ Obsolete] Cheyne.

Syn. -- Atrocious , Flagitious , Flagrant . Flagitious points to an act as grossly wicked and vile; as, a flagitious proposal. Flagrant marks the vivid impression made upon the mind by something strikingly wrong or erroneous; as, a flagrant misrepresentation; a flagrant violation of duty. Atrocious represents the act as springing from a violent and savage spirit. If Lord Chatham, instead of saying "the atrocious crime of being a young man," had used either of the other two words, his irony would have lost all its point, in his celebrated reply to Sir Robert Walpole, as reported by Dr. Johnson.

-- A*tro"cious*ly , adverb -- A*tro"cious*ness , noun

Atrocity A·troc"i·ty noun ; plural Atrocities [ French atrocité , Latin atrocitas , from atrox , atrocis , cruel.] 1. Enormous wickedness; extreme heinousness or cruelty.

2. An atrocious or extremely cruel deed.

The atrocities which attend a victory.
Macaulay.

Atrophic A·troph"ic adjective Relating to atrophy.

Atrophied At"ro·phied p. adjective Affected with atrophy, as a tissue or organ; arrested in development at a very early stage; rudimentary.

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