redhead

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A person with red hair.
• noun A North American duck (Aythya americana), the male of which has a gray back and wings, a red head, and a black breast.

from The Century Dictionary.

• noun A person having red hair.
• noun A red-headed duck, the pochard, Fuligula or Æthyia ferina, a common bird of Europe, a variety of which bears the same name in America and is called more fully red-headed duck, red-headed raftduck, red-headed broadbill, also grayback, Washington canvasback, and American pochard.
• noun The red-headed woodpecker, Melanerpes erythrocephalus. See cut under Melanerpes.
• noun A tropical milkweed, Asclepias Curassavica, with umbels of bright-red flowers.

from the GNU version of the Collaborative International Dictionary of English.

• noun A person having red hair.
• noun An American duck (Aythya Americana) highly esteemed as a game bird. It is closely allied to the canvasback, but is smaller and its head brighter red. Called also red-headed duck. American poachard, grayback, and fall duck. See Illust. under Poachard.
• noun The red-headed woodpecker. See Woodpecker.
• noun (Bot.) A kind of milkweed (Asclepias Curassavica) with red flowers. It is used in medicine.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A person with red hair.
• noun A North American duck Aythya americana, highly esteemed as a game bird.
• noun A kind of milkweed Asclepias curassavica with red flowers, formerly used in medicine.
• noun Chinese red-headed centipede
• noun red-headed bunting
• noun red-headed titi
• noun red-headed vulture
• noun red-headed woodpecker Melanerpes erythrocephalus

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun someone who has red hair
• noun North American diving duck with a grey-and-black body and reddish-brown head
• noun black-and-white North American woodpecker having a red head and neck