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The Collaborative International Dictionary of English v.0.48:

Oosperm \O"o*sperm\ ([=o]"[-o]*sp[~e]rm), n. [Gr. w,'o`n an egg
   + E. sperm.] (Biol.)
   The ovum, after fusion with the spermatozoon in impregnation.
   --Balfour.
   [1913 Webster]