loon definition by Webster's New World
Origin: altered (by associated, association with loon) ; from earlier loom ; from Old Norse lomr ; from Indo-European echoic base an unverified form lā- from source Classical Latin latrare, to bark
- a clumsy, stupid person
- a crazy person
- a boy
- a harlot
- a person of low rank
- a rogue
Origin: Scottish lown, loun ; from Middle English lowen ; from uncertain or unknown; perhaps or akin to Middle Dutch loen
loon definition by American Heritage Dictionary
Origin: Perhaps alteration of dialectal loom, guillemot, diver, from Old Norse lōmr.
Origin: Probably from loon1 (from its loud cry) and influenced by lunatic.