(noun, adjective)


1. harsh or corrosive in tone

- a barrage of acid comments

Similar word(s): unpleasant, acerb, acerbic, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic

2. being sour to the taste

Similar word(s): sour, acidic, acidulent, acidulous

3. having the characteristics of an acid

- an acid reaction

Similar word(s): acidic

Sentences with acid as an adjective:

- acid fruits or liquors


1. 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

Definition categories: substance, compound

2. street name for lysergic acid diethylamide

Similar word(s): dose, dot, elvis, pane, superman

Definition categories: man–made