Meaning

noun 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

adjective harsh or corrosive in tone

noun street name for lysergic acid diethylamide

originFrom French acide, from Latin acidus (“sour, acid”), from aceō (“to be sour”). Doublet of agita.

Etymology from Wiktionary, CC BY-SA 3.0