The cry of a loon (the bird).

An idler, a lout. / (chiefly Scotland, Ulster) A boy, a lad. / (chiefly Scotland) A harlot; mistress. / (chiefly Scotland) A simpleton. / (slang) A crazy or deranged person.

(US, Canada) 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.

plural of loon / Synonym of loon pants

(US, Canada) The great northern diver (Gavia immer)

(Canada, US) The Pacific diver.

(Canada, US) The black-throated diver bird.

plural of Arctic loon

plural of Pacific loon

plural of common loon