martlet
Webster's Dictionary (GCIDE)
Martlet \Mart"let\, n. [F. martinet. See Martin the bird, and cf. Martinet a disciplinarian.] [1913 Webster]
1.(Zool.) The European house martin. [1913 Webster]
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. [1913 Webster]