Definition: loon

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Source: WordNet (r) 1.7 

loon
     n 1: a worthless lazy fellow
     2: large somewhat primitive fish-eating diving bird of the
        northern hemisphere having webbed feet placed far back;
        related to the grebes [syn: diver]
     3: a person with confused ideas; incapable of serious thought
        [syn: addle-head, birdbrain]

Source: Webster's Revised Unabridged Dictionary (1913) 

Loon \Loon\, 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.
Loon \Loon\, n. [For older loom, Icel. l?mr; akin to Dan. & Sw.
   lom.] (Zo["o]l.)
   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.