Lactic
Lactic Lac"tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster]

{Lactic acid} (Physiol. Chem.), a sirupy, colorless fluid, soluble in water, with an intensely sour taste and strong acid reaction. There is one center of optical activity, and this results in the observation of three isomeric modifications all having the formula {C3H6O3}; one is dextrorotatory (L-lactic acid), the other levorotatory (D-lactic acid), and the third an optically inactive mixture of the first two (DL-lactic acid); chemically it is 2-hydroxypropanoic acid. {Sarcolactic acid} or {paralactic acid} occurs chiefly in dead muscle tissue, while {ordinary lactic acid} (DL-lactic acid) results from fermentation, such as the fermentation of milk by lactic acid bacteria. The two acids are alike in having the same constitution (expressed by the name {ethylidene lactic acid}), but the latter is optically inactive, while sarcolactic acid rotates the plane of polarization to the right. The third acid, ethylene lactic acid, accompanies sarcolactic acid in the juice of flesh, and is optically inactive.

{Lactic ferment}, an organized ferment ({Bacterium lacticum} or {Bacterium lactis}), which produces lactic fermentation, decomposing the sugar of milk into carbonic and lactic acids, the latter, of which renders the milk sour, and precipitates the casein, thus giving rise to the so-called spontaneous coagulation of milk.

{Lactic fermentation}. See under {Fermentation}. [1913 Webster +PJC]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • lactic — LÁCTIC adj. (În sintagma) Acid lactic = acid organic care se găseşte în laptele acru, în varza acră, în murături etc. – Din fr. lactique. Trimis de LauraGellner, 16.05.2004. Sursa: DEX 98  láctic adj. m., pl. láctici; f. sg. láctică …   Dicționar Român

  • lactic — pertaining to milk, 1790 (in lactic acid; so called because it was obtained from sour milk), from Fr. lactique, from L. lactis, gen. of lac milk (see LACTATION (Cf. lactation)) + Fr. ique …   Etymology dictionary

  • lactic — ► ADJECTIVE ▪ relating to or obtained from milk …   English terms dictionary

  • lactic — [lak′tik] adj. [Fr lactique: see LACTO & IC] of or obtained from milk …   English World dictionary

  • lactic — Relating to milk. [L. lac (lact ), milk] * * * lac·tic lak tik adj 1 a) of or relating to milk b) obtained from sour milk or whey 2) involving the production of lactic acid <lactic fermentation> * * * lac·tic (lakґtik) pertaining to milk;… …   Medical dictionary

  • lactic — adjective Date: 1790 1. a. of or relating to milk b. obtained from sour milk or whey 2. involving the production of lactic acid …   New Collegiate Dictionary

  • lactic — adj. Lactic is used with these nouns: ↑acid …   Collocations dictionary

  • lactic —   a. pertaining to milk or sour milk.    ♦ lactic acid, acid occurring in sour milk and in muscles when they are exercised hard.    ♦ lactiferous, a. yielding or conveying milk or milky substance.    ♦ lactific, a. producing milk.    ♦… …   Dictionary of difficult words

  • lactic — adj. Chem. of, relating to, or obtained from milk. Phrases and idioms: lactic acid a clear odourless syrupy carboxylic acid formed in sour milk, and produced in the muscle tissues during strenuous exercise. Etymology: L lac lactis milk …   Useful english dictionary

  • lactic — /lak tik/, adj. of, pertaining to, or obtained from milk. [1780 90; LACT + IC] * * * …   Universalium

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