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Definition of loon:

  1. A sorry fellow; a worthless person; a rogue.
  2. Any one of several aquatic, wed- footed, northern birds of the genus Urinator ( formerly Colymbus), noted for their expertness in diving and swimming under water. The common loon, or great northern diver ( Urinator imber, or Colymbus torquatus), and the red- throated loon or diver ( U. septentrionalis), are the best known species. See Diver.

Synonyms:

diver, eccentric, loony, plunger, ding-a-ling, wise, nut, underwater diver, frogman, kook, weirdo, addle-head, crank, addlehead, birdbrain, screwball, lunatic, weirdie, dingbat, crazy.

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