Definition of "loon" []

• Any of several fish-eating, diving birds of the genus Gavia of northern regions, having a short tail, webbed feet, and a laughlike cry. (noun)
• Informal One who is crazy or deranged. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A sad day for conservatives when this loon is the most influential, anyone who thinks this guy has credability I have no respect for and pity them."
• "The word "loon" is supposed to refer to its incapacity, and is from the same root as "lame.""
• "To be compared to a surgery-addicted, alleged kiddy-fiddling loon is not funny, it is highly offensive ."