Webster's English Dictionary

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blastoderm

blas.to.derm or blas.to.der.mic \-.d*rm\ \.blas-t*-.d*r-'mat-ik\ 
   \-'d*r-mik\ n [G, fr. blast- + -derm] : a blastodisc after completion of 
   cleavage and formation of the blastocoe l - blas.to.der.matic aj