blastoderm b la stuh derm n a layer of cells on the inside of the blastula Usage(s) Such words as "blastoderm", "sindoc," "peris," "parasang," "sarcenet," "teazel," "nullah," "cantatrice," "barracan," "sistrum," writhed and hissed in her verses. Synonym(s) germinal disc blastodisc germinal area