algonkian

adjective

1. Geology. Proterozoic(def 1).
2. Algonquian.

noun, plural Al·gon·ki·ans, (especially collectively) Al·gon·ki·an.

3. Geology. Proterozoic(def 2).
4. Algonquian.

noun, adjective

1. an obsolete term for Proterozoic
2. a variant of Algonquian