protostomian in English dictionary protostomian Meanings and definitions of "protostomian" Of or pertaining to the protostomes A protostome adjective Of or pertaining to the protostomes noun A protostome more Grammar and declension of protostomian protostomian ( comparative more protostomian, superlative most protostomian) protostomian ( plural protostomians) protostomian (not comparable) protostomian (plural protostomians) more Sample sentences with "protostomian" Declension Stem Try again Available translations French Portuguese Authors