English

trimer

From tri- + -mer.

Formed from tri + mer

Proto-Indo-European *tréyes ‘three’

English tri

Proto-Indo-European *(s)mer- ‘to fall into thinking, remember, care for’

Proto-Indo-European *(s)méros

Proto-Hellenic *(h)méros

Ancient Greek μέρος ‘part, component, region’

English polymer

English mer

Today it means

noun An oligomer composed of three monomers.

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