\Mart"let\, n. [F. martinet. See {Martin} the bird, and
cf. {Martinet} a disciplinarian.]
1. (Zo["o]l.) The European house martin.
2. [Cf. F. merlette.] (Her.) A bird without beak or feet; --
   generally assumed to represent a martin. As a mark of
   cadency it denotes the fourth son.