Webster's Revised Unabridged Dictionary · 1913

Calumet

Calumet , noun

[French calumet, from Latin calamus reed. See Halm, and compare Shawm.]

A kind of pipe, used by the North American Indians for smoking tobacco. The bowl is usually made of soft red stone, and the tube is a long reed often ornamented with feathers.
Smoked the calumet, the Peace pipe, As a signal to the nations. — Lowgfellow

The calumet is used as a symbol of peace. To accept the calumet is to agree to terms of peace, and to refuse it is to reject them. The calumet of peace is used to seal or ratify contracts and alliances, and as an evidence to strangers that they are welcome.