from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Biology Having the yolk located in the center: a centrolecithal egg.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Having the yolk placed in the centre of the cytoplasm of the ovum.
from the GNU version of the Collaborative International Dictionary of English
- adj. Having the food yolk placed at the center of the ovum, segmentation being either regular or unequal.
from The Century Dictionary and Cyclopedia
- In embryology, having the food-yolk (deutoplasm) central in position, surrounded by peripheral protoplasm.
- In embryology, noting that type of cleavage in which the dividing nuclei pass to the surface of the ovum, leaving the yolk in the center. This form of cleavage is characteristic of the Arthropoda, especially of the insects.
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.