Webster’s Revised Unabridged Dictionary · 1913
Ectolecithal
Ec′to·lec′i·thal (ĕk′tō·lĕs′ĭ·thal), a. [Ecto- + Gr. λέκιθος the yolk of an egg.] (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.