English
allopaternal
From allo- + paternal.
Proto-Indo-European *h₂el- ‘beyond, other’
Proto-Indo-European *h₂élyos ‘other, another’
Proto-Hellenic *áľľos
Ancient Greek ἄλλος ‘other’
English allo-
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 Relating to an allofather
Language periods are conventional ranges, not dates for this word.
Etymograph / allopaternal