Etymograph

English

isoleucine

From iso- + leucine.

Formed from iso- + leucine

Ancient Greek ἴσος ‘equal’

English iso-

Proto-Indo-European *lewk- ‘bright’

Proto-Indo-European *lewkós ‘bright’

Proto-Hellenic *leukós ‘white’

Ancient Greek λευκός ‘white’

English leucine

Today it means

noun An essential amino acid, C₆H₁₃NO₂, isomeric with leucine, found in most animal proteins.

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

Etymograph / isoleucine