from The Century Dictionary and Cyclopedia

  • n. In embryology, the monerula stage of a meroblastic egg which undergoes superficial as well as partial segmentation of the vitellus, and develops in succession into a pericytula, perimorula, periblastula, and perigastrula. It is a cytode which includes formative yolk in the outer wall and nutritive yolk in the interior.


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