• (n.) One of the smaller cells, or blastomeres, resulting from the complete segmentation of a telolecithal ovum.
(from the article `annelid`) In annelids, the first four cells (blastomeres) give rise, by alternating clockwise and counterclockwise divisions, to a cap of smaller cells, called ...
(mi´kro-mēr) one of the small blastomeres formed by unequal cleavage of a fertilized oocyte as the result of asymmetric positioning of the mitotic spindle; see also macromere.
Mi'cro·mere noun [ Micro- + -mere .] (Biol.) One of the smaller cells, or blastomeres, resulting from the complete segmentation of a telolecithal ovum. 
Type: Term Pronunciation: mī′krō-mēr Definitions: 1. A blastomere of small size; for example, one of the blastomeres at the animal pole of an amphibian egg.