blastodisc

noun

blas·​to·​disc ˈbla-stə-ˌdisk 

: the embryo-forming portion of an egg with discoidal cleavage usually appearing as a small disc on the upper surface of the yolk mass see egg illustration

Word History

Etymology

blasto- + disc

First Known Use

1878, in the meaning defined above

Medical Definition

blastodisc

noun

blas·​to·​disc

variants or blastodisk

ˈblas-tə-ˌdisk 

: the embryo-forming portion of an egg with discoidal cleavage usually appearing as a small disc on the upper surface of the yolk mass