2. To sour; to imbitter.

His thin existence all acidified into rage.

Carlyle.

Ac`id*im"e*ter (&?;), n. [L. acidus acid + -meter.] (Chem.) An instrument for ascertaining the strength of acids. Ure.

Ac`id*im"e*try (&?;), n. [L. acidus acid + -metry.] (Chem.) 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 (&?;), a.

A*cid"i*ty (&?;), n. [L. acidites, fr. acidus: cf. F. acidité. See Acid.] The quality of being sour; sourness; tartness; sharpness to the taste; as, the acidity of lemon juice.

Ac"id*ly (&?;), adv. Sourly; tartly.

Ac"id*ness (&?;), n. Acidity; sourness.

A*cid"u*late (&?;), v. t. [imp. & p. p. Acidulated (&?;); p. pr. & vb. n. Acidulating (&?;).] [Cf. F. aciduler. See Acidulous.] To make sour or acid in a moderate degree; to sour somewhat. Arbuthnot.

A*cid"u*lent (&?;), a. Having an acid quality; sour; acidulous. "With anxious, acidulent face." Carlyle.

A*cid"u*lous (&?;), a. [L. acidulus, dim. of acidus. See Acid.] Slightly sour; sub-acid; sourish; as, an acidulous tincture. E. Burke.

Acidulous mineral waters, such as contain carbonic anhydride.

Ac`i*er*age (&?;), n. [F. aciérage, fr. acier steel.] The process of coating the surface of a metal plate (as a stereotype plate) with steellike iron by means of voltaic electricity; steeling.

Ac"i*form (&?;), a. [L. acus needle + -form.] Shaped like a needle.

Ac"i*na"ceous (&?;), a. [L. acinus a grape, grapestone.] (Bot.) Containing seeds or stones of grapes, or grains like them.

||A*cin"a*ces (&?;), n. [L., from Gr. &?;.] (Anc. Hist.) A short sword or saber.

Ac`i*nac"i*form (s`*ns"*fôrm), a. [L. acinaces a short sword + -form: cf. F. acinaciforme.] (Bot.) Scimeter-shaped; as, an acinaciform leaf.

||Ac`i*ne"si*a (s`*n"s*), n. (Med.) Same as Akinesia.

||Ac`i*ne"tæ (s`*n"t), n. pl. [NL., fr. Gr. 'akinhtos immovable.] (Zoöl.) A group of suctorial Infusoria, which in the adult stage are stationary. See Suctoria.

Ac`i*net"i*form (&?;), a. [Acinetæ + -form.] (Zoöl.) Resembling the Acinetæ.

A*cin"i*form (&?;), a. [L. acinus a grape, grapestone + -form: cf. F. acinoforme.] 1. Having the form of a cluster of grapes; clustered like grapes.

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