Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun acid

2 senses of acid

Sense 1
acid -- (any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt)
       => compound, chemical compound -- ((chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight)

Sense 2
acid, back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane, Zen -- (street name for lysergic acid diethylamide)
       => lysergic acid diethylamide, LSD -- (a powerful hallucinogenic drug manufactured from lysergic acid)

Antonyms of adj acid

3 senses of acid

Sense 1
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")

INDIRECT (VIA unpleasant) -> pleasant -- (affording pleasure; being in harmony with your taste or likings; "we had a pleasant evening together"; "a pleasant scene"; "pleasant sensations")

Sense 2
acidic, acid, acidulent, acidulous -- (being sour to the taste)

INDIRECT (VIA sour) -> sweet -- (having or denoting the characteristic taste of sugar)

Sense 3
acid -- (having the characteristics of an acid; "an acid reaction")

INDIRECT (VIA amphoteric, acidic) -> alkaline, alkalic -- (relating to or containing an alkali; having a pH greater than 7; "alkaline soils derived from chalk or limestone")
INDIRECT (VIA acidic, alkaline) -> amphoteric, amphiprotic -- (having characteristics of both an acid and a base and capable of reacting as either)

Similarity of adj acid

3 senses of acid

Sense 1
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")
       => unpleasant (vs. pleasant) -- (disagreeable to the senses, to the mind, or feelings ; "an unpleasant personality"; "unpleasant repercussions"; "unpleasant odors")

Sense 2
acidic, acid, acidulent, acidulous -- (being sour to the taste)
       => sour (vs. sweet) -- (having a sharp biting taste)

Sense 3
acid -- (having the characteristics of an acid; "an acid reaction")
       => acidic (vs. alkaline) (vs. amphoteric) -- (being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7))