martlet

/ˈmɑːrtlɪt/
noun
  1. A mythical bird, often depicted without legs, used in heraldry as a symbol of constant movement or a younger son.
    • In heraldry, the martlet is shown with tufts of feathers instead of legs.
    • The family crest featured a martlet, representing the fourth son who had no land to inherit.
    • The knight's shield was decorated with three gold martlets on a blue background.
  2. A small bird, especially a house martin or a swift.
    • Martlets return to the same nesting sites year after year.
    • The children watched the martlet build its nest under the eaves of the roof.
    • A martlet darted across the evening sky, catching insects on the wing.
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