bilaminar blastoderm

bi·lam·i·nar blas·to·derm

the blastoderm of a young embryo when it consists of only two of the three primary germ layers it will ultimately have.

bilaminar blastoderm

the stage of embryonic development before mesoderm formation in which only the ectoderm and endoderm primary germ layers have formed. Compare trilaminar blastoderm.