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There are 16 fourteen-letter words containing PROTO

DIPROTODONTIDSdiprotodontids n. Plural of diprotodontid.
DIPROTODONTID n. an animal of the Diprotodontidae, an extinct family of marsupials including the genus Diprotodon.
POLYPROTODONTSpolyprotodonts n. Plural of polyprotodont.
POLYPROTODONT n. any member of the Polyprotodontia, the suborder of marsupials, including opossums, dasyures, etc., with many small incisors.
PROTOACTINIUMSPROTOACTINIUM n. a radioactive element that yields actinium on disintegration.
PROTOCHORDATESprotochordates n. Plural of protochordate.
PROTOCHORDATE n. a member of the Protochordata.
PROTOHISTORIANprotohistorian n. One who studies protohistory.
PROTOHISTORIAN n. one who studies protohistory.
PROTOHISTORIESprotohistories n. Plural of protohistory.
PROTOHISTORY n. the study of human beings in the times that immediately antedate recorded history.
PROTOLANGUAGESprotolanguages n. Plural of protolanguage.
proto-languages n. Plural of proto-language.
PROTOLANGUAGE n. an assumed or recorded ancestral language.
PROTONOTARIATSPROTONOTARIAT n. the college constituted by the twelve apostolical prothonotaries (bishops and senior members of the curia) in Rome, also PROTHONOTARIAT.
PROTOPLANETARYprotoplanetary adj. (Astronomy, planets) Of or pertaining to a protoplanet.
protoplanetary adj. Relating to a stage in the life of a red giant star or its protoplanetary nebula during the star’s final…
proto-planetary adj. Alternative form of protoplanetary.
PROTOPLASMATICprotoplasmatic adj. (Cytology) Of or relating to protoplasm.
PROTOPLASMATIC adj. of or like protoplasm, also PROTOPLASMAL, PROTOPLASMIC, PROTOPLASTIC.
PROTOPORPHYRINprotoporphyrin n. (Biochemistry) Any porphyrin that lacks a central metal ion.
PROTOPORPHYRIN n. metal-free porphyrin derived from blood hemin.
PROTOSPATAIRESPROTOSPATAIRE n. the captain of the guards at Byzantium, also PROTOSPATHAIRE, PROTOSPATHARIUS.
PROTOSPATHAIREPROTOSPATHAIRE n. (historical) the captain of the guards at Byzantium, also PROTOSPATAIRE, PROTOSPATHARIUS.
PROTOTYPICALLYprototypically adv. In a prototypical manner.
PROTOTYPICAL adv. relating to a prototype, also PROTOTYPAL, PROTOTYPIC.
PROTOZOOLOGIESPROTOZOOLOGY n. the study of protozoans.
PROTOZOOLOGISTprotozoologist n. A zoologist whose speciality is protozoology.
PROTOZOOLOGIST n. one who studies protozoology.

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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