sis·se·ton \ˈsisətən\noun (pluralsissetonorsissetons) Usage: usually capitalized Etymology: Dakota sisitoṅwaṅ, from sisiṅ, siṅsiṅ besmeared, slimy + toṅwaṅyaṅ, to make a village, dwell at a place : a member of a Dakota people of the northern Mississippi valley