‖Pro‐ thy′a‐lo‐so″ma (?), n.; pl.Prothyalosomata (#). [NL., fr. Gr. πρω̑τοσ first + ὕαλοσ glass + �, �, body.] (Biol.) The investing portion, or spherical envelope, surrounding the eccentric germinal spot of the germinal vesicle.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.