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There are 16 thirteen-letter words containing PROTO

DIPROTODONTIDdiprotodontid n. (Zoology) Any member of the family Diprotodontidae of extinct large marsupials, similar to wombats in form.
DIPROTODONTID n. an animal of the Diprotodontidae, an extinct family of marsupials including the genus Diprotodon.
POLYPROTODONTpolyprotodont n. Any marsupial of the order Polyprotodontia.
POLYPROTODONT n. any member of the Polyprotodontia, the suborder of marsupials, including opossums, dasyures, etc., with many small incisors.
PROTOACTINIUMprotoactinium n. Dated form of protactinium.
PROTOACTINIUM n. a radioactive element that yields actinium on disintegration.
PROTOCERATOPSSorry, definition not available.
PROTOCHORDATEprotochordate n. Any chordate of the phyla Hemichordata, Urochordata or Cephalochordata.
PROTOCHORDATE n. a member of the Protochordata.
PROTOCOLISINGprotocolising v. Present participle of protocolise.
PROTOCOLISE v. to make a protocol of, also PROTOCOLIZE.
PROTOCOLIZINGprotocolizing v. Present participle of protocolize.
PROTOCOLIZE v. to make a protocol of, also PROTOCOLISE.
PROTOGALAXIESprotogalaxies n. Plural of protogalaxy.
PROTOGALAXY n. a galaxy in its initial state of formation.
PROTOHISTORICprotohistoric adj. Of or pertaining to protohistory.
PROTOHISTORIC adj. relating to protohistory.
PROTOLANGUAGEprotolanguage 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.
PROTONOTARIALPROTONOTARIAL adj. of or like a protonotary, a principle law clerk in certain courts of law.
PROTONOTARIATPROTONOTARIAT n. the college constituted by the twelve apostolical prothonotaries (bishops and senior members of the curia) in Rome, also PROTHONOTARIAT.
PROTONOTARIESprotonotaries n. Plural of protonotary.
PROTONOTARY n. a court clerk; a chief clerk of any of various courts of law, also PROTHONOTARY.
PROTOSPATAIREPROTOSPATAIRE n. the captain of the guards at Byzantium, also PROTOSPATHAIRE, PROTOSPATHARIUS.
PROTOTHERIANSprototherians n. Plural of prototherian.
PROTOTHERIAN n. a member of the Prototheria.
PROTOTROPHIESprototrophies 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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