Definitions of loon
  1. noun
    large somewhat primitive fish-eating diving bird of the northern hemisphere having webbed feet placed far back; related to the grebes
    synonyms: diver
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    type of:
    gaviiform seabird
    seabirds of the order Gaviiformes
  2. noun
    a person with confused ideas; incapable of serious thought
    synonyms: addle-head, addlehead, birdbrain
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    type of:
    someone unable to adapt to their circumstances
  3. noun
    a worthless lazy fellow
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    type of:
    bum, do-nothing, idler, layabout, loafer
    person who does no work
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