English
homopaternal
From homo- + paternal.
Proto-Indo-European *sem- ‘one, whole’
Proto-Indo-European *somHós ‘same, alike’
Proto-Hellenic *homós
Ancient Greek ὁμός ‘same’
English homo-
Proto-Indo-European *ph₂tḗr ‘father’
…
Latin pater ‘father’
Latin paternus ‘of or pertaining to a father, paternal’
Vulgar Latin paternālis
Old French paternal ‘of a father’
English paternal
Today it means
adj Of the same father.
Language periods are conventional ranges, not dates for this word.
Etymograph / homopaternal