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1. A person having red hair.

2. (Science: ornithology) 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. The red-headed woodpecker. See Woodpecker.

3. (Science: botany) A kind of milkweed (asclepias Curassavica) with red flowers. It is used in medicine.