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There are 3 eleven-letter words beginning with PROTHALL

PROTHALLIAL	• PROTHALLIAL adj. of or like the prothallium, the growth following a germinating spore, for the purpose of sexual reproduction, producing the antheridia and archegonia.
PROTHALLIUM	• prothallium n. A plant, usually a pteridophyte, in gametophyte stage in the metagenesis cycle. • prothallium n. The young gametophyte of a liverwort or peat moss. • PROTHALLIUM n. the free-living gametophyte of a fern or other vascular cryptogam, also PROTHALLUS.
PROTHALLOID	• PROTHALLOID adj. relating to the prothallus, the gametophyte or sexual generation in ferns and related plants.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the 1Word.ws and WikWik.org.

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English Wiktionary: 1 word
Scrabble in French: no word
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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