The Collaborative International Dictionary of English v.0.48:
Tercelet \Terce"let\, n. (Zool.) A male hawk or eagle; a tiercelet. --Chaucer. [1913 Webster]WordNet (r) 3.0 (2006):
tercelet n 1: male hawk especially male peregrine or gyrfalcon [syn: tiercel, tercel, tercelet]