sire / sīr/ • n. 1. the male parent of an animal, esp. a stallion or bull kept for breeding.2. archaic a respectful form of address for someone of high social status, esp. a king. ∎ a father or other male forebear.• v. [tr.] be the male parent of (an animal). ∎ poetic/lit. (of a person) be the father of.