English
homoatomic
From homo- + atomic.
Proto-Indo-European *sem- ‘one, whole’
Proto-Indo-European *somHós ‘same, alike’
Proto-Hellenic *homós
Ancient Greek ὁμός ‘same’
English homo-
Today it means
adj Describing a molecule, all of whose atoms are of the same element.
Language periods are conventional ranges, not dates for this word.
Etymograph / homoatomic