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There are 12 words beginning with PROTOS

PROTOSTAR	• protostar n. (Astronomy) A collection of gas and dust in space with high temperature that usually grows to the point… • PROTOSTAR n. a condensing mass of gas in the early formation of a star.
PROTOSTARS	• protostars n. Plural of protostar. • PROTOSTAR n. a condensing mass of gas in the early formation of a star.
PROTOSTELE	• protostele 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.
PROTOSTOME	• protostome 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.
PROTOSTELES	• protosteles n. Plural of protostele. • PROTOSTELE n. a stele in which the vascular tissue forms a solid core, with centrally placed xylem surrounded by phloem.
PROTOSTELIC	• protostelic adj. Of or possessing a protostele. • PROTOSTELIC adj. of or like a protostele.
PROTOSTOMES	• protostomes n. Plural of protostome. • PROTOSTOME n. a major group of bilateral metazoan animals, that includes mollusks and annelids.
PROTOSPATAIRE	• PROTOSPATAIRE n. the captain of the guards at Byzantium, also PROTOSPATHAIRE, PROTOSPATHARIUS.
PROTOSPATAIRES	• PROTOSPATAIRE n. the captain of the guards at Byzantium, also PROTOSPATHAIRE, PROTOSPATHARIUS.
PROTOSPATHAIRE	• PROTOSPATHAIRE n. (historical) the captain of the guards at Byzantium, also PROTOSPATAIRE, PROTOSPATHARIUS.
PROTOSPATHAIRES	• PROTOSPATHAIRE n. (historical) the captain of the guards at Byzantium, also PROTOSPATAIRE, PROTOSPATHARIUS.
PROTOSPATHARIUS	• protospatharius n. Alternative form of protospatharios. • PROTOSPATHARIUS n. (historical) the captain of the guards at Byzantium, also PROTOSPATAIRE, PROTOSPATHAIRE.

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: 124 words
Scrabble in French: 3 words
Scrabble in Spanish: 4 words
Scrabble in Italian: 24 words
Scrabble in German: no word
Scrabble in Romanian: 18 words

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