Meaning

adjective pertaining to or causing improvement in the offspring produced

originEtymology tree Proto-Indo-European *h₁wes- Proto-Indo-European *-us Proto-Indo-European *h₁wésus? Proto-Indo-European *h₁es-? Proto-Indo-European *h₁su- Proto-Hellenic *ehu- Ancient Greek ἐΰς (eǘs) Ancient Greek εὖ (eû)der. English eu- Proto-Indo-European *ǵenh₁- Proto-Indo-European *-os Proto-Indo-European *ǵénh₁os Proto-Hellenic *génos Ancient Greek γένος (génos) Proto-Indo-European *-os…

Etymology from Wiktionary, CC BY-SA 3.0