Pronunciation: (spang'kur),[key] —n. 1. Naut. a. a fore-and-aft sail on the aftermost lower mast of a sailing vessel having three or more masts. See diag. under ship. b. a designation given to the mast abaft a mizzenmast, usually the aftermost mast in any vessel.
2. Informal.a smartly moving person or animal, esp. a fast horse.
3. Chiefly New England.something remarkably fine.
—adj.Naut. of or pertaining to a spanker mast or its rigging.