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  • Webster's Revised Unabridged Dictionary
    • a Ectolecithal (Biol) Having the food yolk, at the commencement of segmentation, in a peripheral position, and the cleavage process confined to the center of the egg; as, ectolecithal ova.
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Century Dictionary and Cyclopedia
    • ectolecithal In embryology, nothing those ova which have the food-yolk peripheral in position, and thus exterior to the formative yolk. The cleavage or segmentation is consequently confined at first to the inner parts of the ovum, and it is only in later stages, when the food-yolk has shifted to the center, that the cleavage becomes peripheral. The egg of the spider is an example. See centrolecithal, telolecithal.
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Webster's Revised Unabridged Dictionary
Ecto-, + Gr. the yolk of an egg