Etymology: (1620–30; < L acidus sour, akin to ācer sharp, acētum vinegar, acicula)
Definition of 'ACID'
Princeton's WordNet
1. (noun)acid any of various water-soluble compounds having a sourtaste and capable of turninglitmus red and reacting with a base to form a salt
2. (adj)acid, back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane, Zen streetname for lysergic acid diethylamide
3. (adj)acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic harsh or corrosive in tone "an acerbic tone piercing otherwise flowery prose"; "a barrage of acid comments"; "her acrid remarks make her many enemies"; "bitter words"; "blistering criticism"; "caustic jokes about political assassination, talk-show hosts and medical ethics"; "a sulfurous denunciation"; "a vitriolic critique"
4. (adj)acidic, acid, acidulent, acidulous beingsour to the taste
5. (adj)acid having the characteristics of an acid "an acid reaction"
4. (noun)ACID one of a class of compounds, generally but not always distinguished by their sour taste, solubility in water, and reddening of vegetableblue or violetcolors. They are also characterized by the power of destroying the distinctive properties of alkalies or bases, combining with them to form salts, at the sametime losing their own peculiar properties. They all contain hydrogen, united with a morenegativeelement or radical, either alone, or more generally with oxygen, and take their names from this negativeelement or radical. Those which contain no oxygen are sometimes called hydracids in distinction from the others which are called oxygen acids or oxacids