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WordReference Random House Learner's Dictionary of American English © 2024ac•id /ˈæsɪd/USA pronunciation n. - Chemistrya chemical substance capable of turning blue litmus paper red; a substance with a sour taste: [uncountable]How much acid is in the soil?[countable]An acid will dissolve the grease.
- Slang Terms[uncountable]the drug LSD.
adj. - Chemistrybelonging or relating to acids.
- sharp or biting to the taste;
sour:the acid flavor of lime. - sharp, biting, or sarcastic:acid criticism.
a•cid•ic /əˈsɪdɪk/USA pronunciation adj. a•cid•i•ty, n. [uncountable]ac•id•ly, adv. ac•id•ness, n. [uncountable]See -acr-. WordReference Random House Unabridged Dictionary of American English © 2024ac•id (as′id),USA pronunciation n. - Chemistrya compound usually having a sour taste and capable of neutralizing alkalis and reddening blue litmus paper, containing hydrogen that can be replaced by a metal or an electropositive group to form a salt, or containing an atom that can accept a pair of electrons from a base. Acids are proton donors that yield hydronium ions in water solution, or electron-pair acceptors that combine with electron-pair donors or bases.
- a substance with a sour taste.
- something, as a remark or piece of writing, that is sharp, sour, or ill-natured:His criticism was pure acid.
- Slang TermsSee LSD (def. 2).
- British Terms put on the acid, [Australian Slang.]to importune someone, as for money, sexual favors, or confidential information.
adj. - Chemistry
- belonging or pertaining to acids or the anhydrides of acids.
- having only a part of the hydrogen of an acid replaced by a metal or its equivalent:an acid phosphate.
- having a pH value of less than 7. Cf. alkaline (def. 4).
- sharp or biting to the taste;
tasting like vinegar;
sour:acid fruits. - sharp, biting, or ill-natured in mood, manner, etc.:an acid remark; an acid wit.
- Geologycontaining much silica.
- Metallurgynoting, pertaining to, or made by a process in which the lining of the furnace, or the slag that is present, functions as an acid in high-temperature reactions in taking electrons from oxide ions: usually a siliceous material, as sand or ganister. Cf. basic (def. 3).
- Latin acidus sour, akin to ācer sharp, acētum vinegar, acescent, acicula
- 1620–30
- 8.See corresponding entry in Unabridged acerbic, stinging, vitriolic, tart. Acid, astringent are terms used figuratively of wit or humor. Acid suggests a sharp, biting, or ill-natured quality:an acid joke about an opponent.Astringent connotes severity but usually also a bracing quality, as of something applied with curative intent:astringent criticism.
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