English

eutomer

From eu- + enantiomer.

Proto-Indo-European *h₁su- ‘good’

Proto-Hellenic *ehu- ‘good’

Ancient Greek ἐΰς ‘good, brave, noble’

Ancient Greek εὖ ‘well, good’

English eu-

Today it means

noun The more pharmacologically active of the enantiomers of a drug.

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