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Webster 1913 Edition

Adj.

[Gr.

ἀ

priv. + [GREEK] yelk.]

(Biol.)

Applied to those ova which segment uniformly, and which have little or no food yelk embedded in their protoplasm.

Balfour.

alecithal ‎(not comparable)

(biology, of an ovum) Tending to segment uniformly, and having little or no yolk embedded in the protoplasm.
(Can we find and add a quotation of Balfour to this entry?)