/ Dictionary / Index P Petrobrusian: Meaning and Definition of Find definitions for: Pet•ro•bru•sian Pronunciation: (pe"trō-br'zhun, -shun), [key] — n. a member of a 12th-century sect in S France that rejected the Mass, infant baptism, prayers for the dead, sacerdotalism, the veneration of the cross, and the building of churches. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. petro petrochemical Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language