mesomere

(mĕz'ə-mîr', mĕs'-)

1. A blastomere of intermediate size, larger than a micromere but smaller than a macromere.
2. The middle zone of the mesoderm of a chordate vertebrate embryo, from which excretory tissue develops.

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1. A blastomere of intermediate size, that is larger than a micromere but smaller than a macromere.
2. The middle zone of the mesoderm of a chordate embryo, from which excretory tissue develops.

1. a blastomere of size intermediate between a macromere and a micromere.
2. a midzone of the mesoderm between the epimere and hypomere.