noun, plural Al·gon·ki·ans, (especially collectively) Al·gon·ki·an.
Examples from the Web for algonkian
The vast length of Algonkian time is shown by the thickness of its marine deposits and by the cycles of erosion which it includes.The Elements of Geology|William Harmon Norton
The languages of the Algonkian family are as diverse as the Indo-European tongues.Sketch of the Mythology of the North American Indians|John Wesley Powell
Two important ones, however—namely, Archean and Algonkian—are of American birth.North America|Israel C. Russell
Geologists speak of these splashes of Algonkian rocks as the Unkar group, another local Indian designation.The Book of the National Parks|Robert Sterling Yard
The remainder of Finland is built up of the oldest known crystalline rocks belonging to the Archaeozoic or Algonkian period.