Webster's Dictionary, 1913

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Achenial adjective Pertaining to an achene.

Acheron noun [ Latin , from Greek ....] (Myth.) A river in the Nether World or infernal regions; also, the infernal regions themselves. By some of the English poets it was supposed to be a flaming lake or gulf. Shak.

Acherontic adjective Of or pertaining to Acheron; infernal; hence, dismal, gloomy; moribund.

Achievable adjective Capable of being achieved. Barrow.

Achievance noun [ Confer Old French achevance .] Achievement. [ Obsolete] Sir T. Elyot.

Achieve transitive verb [ imperfect & past participle Achieved ; present participle & verbal noun Achieving ] [ Middle English acheven , Old French achever , achiever , French achever , to finish; à (L. ad ) + Old French chief , French chef , end, head, from Latin caput head. See Chief .]
1. To carry on to a final close; to bring out into a perfected state; to accomplish; to perform; -- as, to achieve a feat, an exploit, an enterprise.

Supposing faculties and powers to be the same, far more may be achieved in any line by the aid of a capital, invigorating motive than without it.
I. Taylor.

2. To obtain, or gain, as the result of exertion; to succeed in gaining; to win.

Some are born great, some achieve greatness.
Shak.

Thou hast achieved our liberty.
Milton.

[ [Obs]., with a material thing as the aim.]

Show all the spoils by valiant kings achieved .
Prior.

He hath achieved a maid
That paragons description.
Shak.

3. To finish; to kill. [ Obsolete] Shak.

Syn. -- To accomplish; effect; fulfill; complete; execute; perform; realize; obtain. See Accomplish .

Achievement (-m e nt) noun [ Confer French achèvement , English Hatchment .]
1. The act of achieving or performing; an obtaining by exertion; successful performance; accomplishment; as, the achievement of his object.

2. A great or heroic deed; something accomplished by valor, boldness, or praiseworthy exertion; a feat.

[ The exploits] of the ancient saints . . . do far surpass the most famous achievements of pagan heroes.
Barrow.

The highest achievements of the human intellect.
Macaulay.

3. (Her.) An escutcheon or ensign armorial; now generally applied to the funeral shield commonly called hatchment . Cussans.

Achiever noun One who achieves; a winner.

Achillean adjective Resembling Achilles, the hero of the Iliad; invincible.

Achilles' tendon noun [ Latin Achillis tendo .] (Anat.) The strong tendon formed of the united tendons of the large muscles in the calf of the leg, an inserted into the bone of the heel; -- so called from the mythological account of Achilles being held by the heel when dipped in the River Styx.

Achilous adjective [ Greek 'a priv. + ... lip.] (Botany) Without a lip.

Aching adjective That aches; continuously painful. See Ache . -- Ach"ing*ly , adverb

The aching heart, the aching head.
Longfellow.

Achiote noun [ Spanish achiote , from Indian achiotl .] Seeds of the annotto tree; also, the coloring matter, annotto.

Achlamydate adjective [ Greek 'a priv. + .... .... a short cloak.] (Zoology) Not possessing a mantle; -- said of certain gastropods.

Achlamydeous adjective (Botany) Naked; having no floral envelope, neither calyx nor corolla.

Acholia noun [ New Latin , from Greek ...; 'a priv. + ... bile.] (Medicine) Deficiency or want of bile.

Acholous adjective (Medicine) Lacking bile.

Achromatic adjective [ Greek ... colorless; 'a priv. + ..., ..., color: confer French achromatique .]
1. (Opt.) Free from color; transmitting light without decomposing it into its primary colors.

2. (Biol.) Uncolored; not absorbing color from a fluid; -- said of tissue.

Achromatic lens (Opt.) , a lens composed usually of two separate lenses, a convex and concave, of substances having different refractive and dispersive powers, as crown and flint glass, with the curvatures so adjusted that the chromatic aberration produced by the one is corrected by other, and light emerges from the compound lens undecomposed. -- Achromatic prism . See Prism . -- Achromatic telescope , or microscope , one in which the chromatic aberration is corrected, usually by means of a compound or achromatic object glass, and which gives images free from extraneous color.

Achromatically adverb In an achromatic manner.

Achromaticity noun Achromatism.

Achromatin noun (Biol.) Tissue which is not stained by fluid dyes. W. Flemming.

Achromatism noun [ Confer French achromatisme .] The state or quality of being achromatic; as, the achromatism of a lens; achromaticity. Nichol.

Achromatization noun [ Confer French achromatisation .] The act or process of achromatizing.

Achromatize transitive verb [ imperfect & past participle Achromatized ; present participle & verbal noun Achromatizing ] [ Greek 'a priv. + ... color.] To deprive of color; to make achromatic.

Achromatopsy noun [ Greek 'a priv. + ... color + ... sight.] Color blindness; inability to distinguish colors; Daltonism.

Achromatous adjective [ See Ahromatic .] Lacking, or deficient in, color; as, achromatous blood.

Achromic adjective [ Greek ... colorless; ... priv. + ... color.] Free from color; colorless; as, in Physiol. Chem. , the achromic point of a starch solution acted upon by an amylolytic enzyme is the point at which it fails to give any color with iodine.

Achronic adjective See Acronyc .

Achroous adjective [ Greek ...; 'a priv. + ... color.] Colorless; achromatic.

Achroödextrin noun [ Greek ... colorless + English dextrin .] (Physiol. Chem.) Dextrin not colorable by iodine. See Dextrin .

Achylous adjective [ Greek ... without juice.] (Physiol.) Without chyle.

Achymous adjective [ Greek ... without juice.] (Physiol.) Without chyme.

Acicula noun ; plural Aciculæ [ Latin , a small needle, dimin. of acus needle.] (Nat. Hist.) One of the needlelike or bristlelike spines or prickles of some animals and plants; also, a needlelike crystal.

Acicular adjective Needle-shaped; slender like a needle or bristle, as some leaves or crystals; also, having sharp points like needles.

Aciculate, Aciculated adjective (Nat. Hist.) (a) Furnished with aciculæ. (b) Acicular. (c) Marked with fine irregular streaks as if scratched by a needle. Lindley.

Aciculiform adjective [ Latin acicula needle + -form .] Needle-shaped; acicular.

Aciculite noun (Min.) Needle ore. Brande & C.

Acid adjective [ Latin acidus sour, from the root ak to be sharp: confer French acide . Confer Acute .]
1. Sour, sharp, or biting to the taste; tart; having the taste of vinegar: as, acid fruits or liquors. Also fig.: Sour- tempered.

He was stern and his face as acid as ever.
A. Trollope.

2. Of or pertaining to an acid; as, acid reaction.

Acid noun
1. A sour substance.

2. (Chemistry) One of a class of compounds, generally but not always distinguished by their sour taste, solubility in water, and reddening of vegetable blue or violet colors. They are also characterized by the power of destroying the distinctive properties of alkalies or bases, combining with them to form salts, at the same time losing their own peculiar properties. They all contain hydrogen, united with a more negative element or radical, either alone, or more generally with oxygen, and take their names from this negative element or radical. Those which contain no oxygen are sometimes called hydracids in distinction from the others which are called oxygen acids or oxacids .

» In certain cases, sulphur, selenium, or tellurium may take the place of oxygen, and the corresponding compounds are called respectively sulphur acids or sulphacids , selenium acids , or tellurium acids . When the hydrogen of an acid is replaced by a positive element or radical, a salt is formed, and hence acids are sometimes named as salts of hydrogen; as hydrogen nitrate for nitric acid, hydrogen sulphate for sulphuric acid, etc. In the old chemistry the name acid was applied to the oxides of the negative or nonmetallic elements, now sometimes called anhydrides .

Acid process (Iron Metal.) That variety of either the Bessemer or the open-hearth process in which the converter or hearth is lined with acid, that is, highly siliceous, material. Opposed to basic process .

Acidic adjective (Min.) Containing a high percentage of silica; -- opposed to basic .

Acidiferous adjective [ Latin acidus sour + -ferous .] Containing or yielding an acid.

Acidifiable adjective Capable of being acidified, or converted into an acid.

Acidific adjective Producing acidity; converting into an acid. Dana.

Acidification noun [ Confer French acidification .] The act or process of acidifying, or changing into an acid.

Acidifier noun (Chemistry) A simple or compound principle, whose presence is necessary to produce acidity, as oxygen, chlorine, bromine, iodine, etc.

Acidify transitive verb [ imperfect & past participle Acidified ; present participle & verbal noun Acidifying ] [ Latin acidus sour, acid + -fy : confer French acidifier .]
1. To make acid; to convert into an acid; as, to acidify sugar.

2. To sour; to imbitter.

His thin existence all acidified into rage.
Carlyle.

Acidimeter noun [ Latin acidus acid + -meter .] (Chemistry) An instrument for ascertaining the strength of acids. Ure.

Acidimetry noun [ Latin acidus acid + -metry .] (Chemistry) The measurement of the strength of acids, especially by a chemical process based on the law of chemical combinations, or the fact that, to produce a complete reaction, a certain definite weight of reagent is required. -- Ac`id*i*met"ric*al adjective

Acidity noun [ Latin acidites , from acidus : confer French acidité . See Acid .] The quality of being sour; sourness; tartness; sharpness to the taste; as, the acidity of lemon juice.