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Meaning of prothallium

pro•thal•li•um

Pronunciation: (prō-thal'ē-um), [key]
— pl. -thal•li•a
  1. the gametophyte of ferns and related plants.
  2. the analogous rudimentary gametophyte of seed-bearing plants.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.