ypsiliform


From The Collaborative International Dictionary of English v.0.48:

Ypsiliform \Yp*sil"i*form\, a. [Gr. ? ? the name of the letter ?
   + -form.] (Biol.)
   Resembling the ? in appearance; -- said of the germinal spot
   in the ripe egg at one of the stages of fecundation.
   [1913 Webster]
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