List of 13-letter words beginning with

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There are 14 thirteen-letter words beginning with PROTO

PROTOACTINIUM	• protoactinium n. Dated form of protactinium. • PROTOACTINIUM n. a radioactive element that yields actinium on disintegration.
PROTOCERATOPS	Sorry, definition not available.
PROTOCHORDATE	• protochordate n. Any chordate of the phyla Hemichordata, Urochordata or Cephalochordata. • PROTOCHORDATE n. a member of the Protochordata.
PROTOCOLISING	• protocolising v. Present participle of protocolise. • PROTOCOLISE v. to make a protocol of, also PROTOCOLIZE.
PROTOCOLIZING	• protocolizing v. Present participle of protocolize. • PROTOCOLIZE v. to make a protocol of, also PROTOCOLISE.
PROTOGALAXIES	• protogalaxies n. Plural of protogalaxy. • PROTOGALAXY n. a galaxy in its initial state of formation.
PROTOHISTORIC	• protohistoric adj. Of or pertaining to protohistory. • PROTOHISTORIC adj. relating to protohistory.
PROTOLANGUAGE	• protolanguage n. Alternative form of proto-language. • proto-language n. (Linguistics) A language which is reconstructed by examining similarities in existing languages to try… • proto-language n. (Linguistics) The early utterances produced by an infant before it acquires true language.
PROTONOTARIAL	• PROTONOTARIAL adj. of or like a protonotary, a principle law clerk in certain courts of law.
PROTONOTARIAT	• PROTONOTARIAT n. the college constituted by the twelve apostolical prothonotaries (bishops and senior members of the curia) in Rome, also PROTHONOTARIAT.
PROTONOTARIES	• protonotaries n. Plural of protonotary. • PROTONOTARY n. a court clerk; a chief clerk of any of various courts of law, also PROTHONOTARY.
PROTOSPATAIRE	• PROTOSPATAIRE n. the captain of the guards at Byzantium, also PROTOSPATHAIRE, PROTOSPATHARIUS.
PROTOTHERIANS	• prototherians n. Plural of prototherian. • PROTOTHERIAN n. a member of the Prototheria.
PROTOTROPHIES	• prototrophies n. Plural of prototrophy. • PROTOTROPHY n. the state of being prototrophic.

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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English Wiktionary: 133 words
Scrabble in French: 27 words
Scrabble in Spanish: 23 words
Scrabble in Italian: 35 words
Scrabble in German: no word
Scrabble in Romanian: 63 words

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