English

isoacid

From iso- + acid.

Formed from iso- + acid

Ancient Greek ἴσος ‘equal’

English iso-

Proto-Indo-European *h₂eḱ- ‘sharp’

…

Proto-Italic *akēō

Latin aceō ‘to be sour’

Latin acidus ‘sour’

French acide ‘acid’

English acid

Today it means

noun Any branched-chain fatty acid

Language periods are conventional ranges, not dates for this word.