Entry 1 sense Webster, 1913 Tiercel · Tier·cel · IPA /ˈtɜː(ɹ)səl/ 01 n. The male of various falcons, esp. of the peregrine; also, the male of the goshawk. 1. The male of various falcons, esp. of the peregrine; also, the male of the goshawk.(Falconry)