Pronunciation: (kā-yOO'gu, kī-),[key] —n., —pl.-gas,(esp. collectively)-ga. 1. a member of a tribe of North American Indians, the smallest tribe of the Iroquois Confederacy.
2. the dialect of the Seneca language spoken by the Cayuga.
3. Also called Cayu'ga duck'. one of an American breed of domestic ducks having black plumage.