D defs.my
Entry 1 sense Webster, 1913

Illinois

/ĭlˌ-ən-oi'/ · Il·li·nois · IPA /ˌɪləˈnɔɪ/
01 n. sing. & pl. A tribe of North American Indians, which formerly occupied the region between the Wabash and Mississippi rivers.
  1. 1.
    A tribe of North American Indians, which formerly occupied the region between the Wabash and Mississippi rivers.(Ethnol.)