neoblast noun2 •A large, undifferentiated cell of annelid worms that participate in regeneration of lost parts.To trigger neoblast proliferation and differentation,^([sic]) two days head and tail regenerating animals were used for the preparation of the libraries. — 2015 •A crystal or mineral species in metamorphic rock, formed more recently, by recrystallization, than others in the same rock. formsneoblasts