Proto-Algonquian: Meaning and Definition of

Pro•to-Al•gon•qui•an

Pronunciation: (prō"tō-al-gong'kē-un, -kwē-un), [key]
— n.
  1. the unattested parent language from which the Algonquian languages are descended.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.