/ Dictionary / Index P Proto-Algonquian: Meaning and Definition of Find definitions for: Pro•to-Al•gon•qui•an Pronunciation: (prō"tō-al-gong'kē-un, -kwē-un), [key] — n. the unattested parent language from which the Algonquian languages are descended. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. protoactinium protoavis Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language