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Webster 1913 Edition
Tiercelet
{
Tier′cel
,Tierce′let
, }Noun.
[OE.
tercel
, tercelet
, F. tiercelet
, a dim. of (assumed) tiercel
, or LL. tertiolus
, dim. fr. L. tertius
the third; – so called, according to some, because every third bird in the nest is a male, or, according to others, because the male is the third part less than female. Cf. Tercel
.] (Falconry)
The male of various falcons, esp. of the peregrine; also, the male of the goshawk.
Encyc. Brit.