n.
1.a member of any of the North American Indian groups speaking an Athapaskan language and living in the subarctic regions of western Canada and central Alaska
2.a group of Amerindian languages (the name coined by an American anthropologist, Edward Sapir)
Idiom of the Day
go off on a tangent
to suddenly change one's line of thought or course of action
The speaker suddenly went off on a tangent and began to speak about something totally different.