adjective.
Of or pertaining to one's father, his genes, his relatives, or his side of a family; as, "paternal grandfather" (one's father's father).
adjective.
Fatherly; behaving as or characteristic of a father.
adjective.
Received or inherited from one's father.
adjective.
Acting as a father; as in "paternal filicide" (murder of a son committed by his father).