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There are 11 words beginning with PROTHA

PROTHALLI	• prothalli n. Plural of prothallus. • PROTHALLUS n. the free-living gametophyte of a fern or other vascular cryptogam, also PROTHALLIUM.
PROTHALLIA	• prothallia n. Plural of prothallium. • PROTHALLIUM n. the free-living gametophyte of a fern or other vascular cryptogam, also PROTHALLUS.
PROTHALLIC	• PROTHALLIC adj. relating to a prothallus, the growth following a germinating spore, for the purpose of sexual reproduction.
PROTHALLUS	• prothallus n. A prothallium. • PROTHALLUS n. the free-living gametophyte of a fern or other vascular cryptogam, also PROTHALLIUM.
PROTHALAMIA	• prothalamia n. Plural of prothalamion. • prothalamia n. Plural of prothalamium. • PROTHALAMIUM n. (Spenser) a song in honour of a marriage, also PROTHALAMION.
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.
PROTHALAMION	• prothalamion n. (Literary) A song or poem in honour of a bride and bridegroom about to be married. • PROTHALAMION n. (Spenser) a song in honour of a marriage, also PROTHALAMIUM.
PROTHALAMIUM	• prothalamium n. Alternative form of prothalamion. • PROTHALAMIUM n. (Spenser) a song in honour of a marriage, also PROTHALAMION.
PROTHALLUSES	• prothalluses n. Plural of prothallus. • PROTHALLUS n. the free-living gametophyte of a fern or other vascular cryptogam, also PROTHALLIUM.

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: 10 words
Scrabble in French: 2 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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