English
eusocial
From eu- + social.
Proto-Indo-European *h₁su- ‘good’
Proto-Hellenic *ehu- ‘good’
Ancient Greek ἐΰς ‘good, brave, noble’
Ancient Greek εὖ ‘well, good’
English eu-
Proto-Indo-European *sekʷ- ‘to follow’
…
Archaic Latin sokios
Latin socius ‘a companion’
Latin sociālis ‘of or belonging to a companion or…’
Middle French social ‘allied’
English social
Today it means
adj Of or pertaining to certain social animals' societies (such as those of ants) in which sterile individuals work for reproductive individuals whose genetic endowment they share.
Language periods are conventional ranges, not dates for this word.
Etymograph / eusocial