Where does “acid” come from?

Acid comes from French acide, from Latin acidus, derived from the Proto-Italic root akēō and ultimately Proto-Indo-European h₂eḱ-, meaning to be sharp or sour.

acid (English): Sour, sharp, or biting to the taste; tart; having...

Definitions

Sour, sharp, or biting to the taste; tart; having...

Ancestry of “acid”, step by step

Step	Language	Word	Meaning
1	French	acide	acid, acidic, sour, tart; acid, acidic; acid
2	Latin	acidus	sour, tart, acid, bitter; harsh, grating, rough,...
3	Latin	aceō	—
4	Proto-Italic	akēō	be sharp-tasting, be sour
5	Proto-Indo-European	h₂eḱ-éh₁-ye-ti	—
6	Proto-Indo-European	h₂eḱ-	sharp

Words derived from “acid”

acidic
acidosis
ketoacidosis
acidly
antacid
acidemia
acidify
aciduria
subacid
diacid
acidaemia
ketoacid
acidogenic
nonacid
acidolysis
haloacid
nonacidic
polyacid
acidy
oxoacid
monacid
acidogenesis
superacid
acidifier

Every word from Proto-Indo-European h₂eḱ- →

acid — Etymology, Origin & Word History | Etymology Explorer