English
dimer
From di- + -mer.
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 A molecule consisting of two identical halves, formed by joining two identical molecules, sometimes with a single atom acting as a bridge.
Language periods are conventional ranges, not dates for this word.
Etymograph / dimer