from The Century Dictionary and Cyclopedia

  • Germinating from the surface of the ovum: noting those meroblastic eggs which, by superficial segmentation of the vitellus, produce a perigastrula in germinating.


Sorry, no etymologies found.


  • In the periblastic the food-yelk is in the centre, enclosed inside the ovum (hence they are also called "centrolecithal" ova): the formative yelk surrounds the food-yelk, and so suffers itself a superficial cleavage.

    The Evolution of Man — Volume 1

  • According as the yelk-food accumulates at the centre or at the side of the ovum, we distinguish two groups of dividing ova, periblastic and discoblastic.

    The Evolution of Man — Volume 1


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