n. A chief among some tribes of American Indians; a sagamore.n. One of a body of high officials in the Tammany Society of New York city. The sachems proper number twelve, and the head of the society is styled grand sachem.n. An American hesperiid butterfly, Hylephila campestris, which occurs throughout the eastern two thirds of the United States. Its larvæ feed on grasses. It was formerly known under the specific name of huron, which probably gave rise to the popular name of sachem.