D defs.my
Entry 2 senses Webster, 1913

Martlet

· Mart·let · IPA /ˈmɑɹt.lət/
01 n. The European house martin.
  1. 1.
    The European house martin.(Zool.)
  2. 2.
    A bird without beak or feet; -- generally assumed to represent a martin. As a mark of cadency it denotes the fourth son.(Her.)