The Collaborative International Dictionary of English v.0.48:

Alecithal \A*lec"i*thal\, a. [Gr. 'a priv. + ? yelk.] (Biol.)
   Applied to those ova which segment uniformly, and which have
   little or no food yelk embedded in their protoplasm.
   --Balfour.
   [1913 Webster]