PRO THYALOSOMA

‖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.