• Webster's Revised Unabridged Dictionary
    • a Ypsiliform (Biol) Resembling the Y in appearance; -- said of the germinal spot in the ripe egg at one of the stages of fecundation.
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Century Dictionary and Cyclopedia
    • ypsiliform Shaped like the Greek capital letter Υ; Y-shaped. The figure is also called arietiform, the symbol of the zodiacal sign Aries being the same.
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Webster's Revised Unabridged Dictionary
Gr. the name of the letter Y + -form,


In literature:

Associated Words: ypsiloid, ypsiliform.
"Putnam's Word Book" by Louis A. Flemming