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Meaning of Proto-Algonquian

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.