Found 2 items, similar to prothalli.
English → English (WordNet) Definition: prothalli prothalli See prothallus
English → English (gcide) Definition: Prothalli Prothallus \Pro*thal"lus\, n.; pl. Prothalli. [NL., fr. Gr. ? before + ? a young shoot.] (Bot.) The minute primary growth from the spore of ferns and other Pteridophyta, which bears the true sexual organs; the o["o]phoric generation of ferns, etc. [1913 Webster]