GNU Collaborative International Dictionary of English

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Found 2 definitions

1.       
   Loon (lo͞on), n. [Scot. loun, lown, loon; akin to OD. loen a stupid man; prob. for an older lown, and akin to E. lame.] A sorry fellow; a worthless person; a rogue.
   
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2.       
   Loon, n. [For older loom, Icel. lōmr; akin to Dan. & Sw. lom.] (Zool.) 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 (Urinator septentrionalis), are the best known species. See Diver.
   
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