ectolecithal

from The Century Dictionary.

• In embryology, nothing those ova which have the food-yolk peripheral in position, and thus exterior to the formative yolk.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective biology Having the food yolk, at the commencement of segmentation, in a peripheral position, and the cleavage process confined to the centre of the egg.