entomere

from The Century Dictionary.

• noun In embryology, the more granular of the two blastomeres into which the mammalian ovum divides, or a descendant of it in the first stages of development.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Biol.) The more granular cells, which finally become internal, in many segmenting ova, as those of mammals.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biology One of the more granular cells, which finally become internal, in many segmenting ova, such as those of mammals.