- a 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.
- LSD1.
- 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.
- 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.
- containing much silica.
- noting, 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.
- to importune someone, as for money, sexual favors, or confidential information.
- any substance that dissociates in water to yield a sour corrosive solution containing hydrogen ions, having a pH of less than 7, and turning litmus red
- a sour-tasting substance
- a slang name for LSD
- chem
- of, derived from, or containing acid
- being or having the properties of an acid
- sharp or sour in taste
- cutting, sharp, or hurtful in speech, manner, etc; vitriolic; caustic
- (of rain, snow, etc) containing pollutant acids in solution
- (of igneous rocks) having a silica content of more than 60% of the total and containing at least one tenth quartz
- of or made by a process in which the furnace or converter is lined with an acid material
