The male parent of an animal, especially a domesticated mammal. The plant or gamete responsible for fertilizing an ovule that develops into a seed.
Archaic A male ancestor; a forefather.
Archaic A gentleman of rank.
Archaic Used as a form of address for a superior, especially a king.
To be the biological father of (a child).
To be the male individual or gamete producing (an animal's offspring or a plant's seed) through sexual reproduction: the boar that sired the litter; pollen grains siring seeds.