loon

Short definition from Wiktionary

Noun

1. 1
   A crazy or deranged person; a lunatic.
2. 2
   An idler, a lout.
3. 3
   A boy, a lad.
4. 4
   A harlot; mistress.
5. 5
   A simpleton.
6. 6
   An English soldier of an expeditionary army in Ireland.
7. 7
   A round area of pavement that protrudes from one side of a road to accommodate turning vehicles with a wide turning circle.
8. 8
   Any of various birds, of the order Gaviiformes, of North America and Europe that dive for fish and have a short tail, webbed feet and a yodeling cry.

Proper noun

1. 1
   A municipality of Bohol, Philippines.