English

heteromolecule

From hetero- + molecule.

Proto-Indo-European *sem- ‘one, whole’

Proto-Indo-European *sḿ̥teros

Proto-Hellenic *hə́teros

Ancient Greek ἕτερος ‘other, another, different’

Latin mōlēs ‘a mass’

New Latin mōlēcula

French molécule

Today it means

noun A molecule composed of multiple types of atoms.

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

Etymograph / heteromolecule