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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.