English

triacid

From tri- + acid.

Formed from tri- + acid

Proto-Indo-European *tri- ‘three, threefold’

Proto-Italic *tri- ‘three, tri-’

English tri-

Proto-Indo-European *h₂eḱ- ‘sharp’

…

Proto-Italic *akēō

Latin aceō ‘to be sour’

Latin acidus ‘sour’

French acide ‘acid’

English acid

Today it means

adj Capable of combining with three molecules of a monobasic acid

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