pro·thal·lus 
(prō-thăləs) or pro·thal·li·um (-thălē-əm)
(prō-thăləs) or pro·thal·li·um (-thălē-əm)n. pl. pro·thal·li (-thălī) or pro·thal·li·a (-thălē-ə)
A small, flat, delicate structure produced by a germinating spore and bearing sex organs. It is the gametophyte of ferns and some other plants.
[New Latin : PRO-2 + Greek thallos, shoot (from thallein, to sprout).]
pro·thalli·al (-lē-əl) adj.
- phytate
- -phyte
- phytic acid
- phyto-
- phytochemical
- phytochemically
- phytochemist
- phytochemistry
- phytochrome
- phytoestrogen
- phytogenesis
- phytogenetic
- phytogenetical
- phytogenetically
- phytogenic
- phytogenous
- phytogeny
- phytogeographer
- phytogeographic
- phytogeographical
- phytogeography
- phytography
- phytohemagglutinin
- phytohormone
- phytol