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There are 3 ten-letter words beginning with PROTOS

PROTOSTARSprotostars n. Plural of protostar.
PROTOSTAR n. a condensing mass of gas in the early formation of a star.
PROTOSTELEprotostele n. (Botany) A type of stele, in which the vascular tissue in the stem forms a solid core, with no central…
PROTOSTELE n. a stele in which the vascular tissue forms a solid core, with centrally placed xylem surrounded by phloem.
PROTOSTOMEprotostome n. Any animal, of the taxon Protostomia, in which the mouth is derived from the embryonic blastopore.
PROTOSTOME n. a major group of bilateral metazoan animals, that includes mollusks and annelids.

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 WikWik.org and 1Word.ws.

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See this list for:

  • English Wiktionary: 14 words
  • Scrabble in French: no word
  • Scrabble in Spanish: 1 word
  • Scrabble in Italian: 8 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 2 words


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