Koihoma (Coixoma), also known ambiguously as Coto (Koto) and Oregone (Orejón), neither its actual name, is an extinct, apparently Witotoan language of Peru.Campbell, Lyle. (1997). American Indian languages: The historical linguistics of Native America. New York: Oxford University Press. . The name is derived from the Murui Huitoto language. According to Rafael Girard (1958), the Orejón called themselves , said to bean both 'sun', 'moon' and 'people'.

Vocabulary +"Oregone" (Koihoma) vocabularyglossKoihomadevilanaskymunastaricocloudiniridineurainnokisunidomamoonhuitsarathundermounalightningsaitsanaearthnaniwaterainoesandmainitatreeanainawoodgrangaimancomaiwomanerignoheadhuhahairhupodikieyeoiforeheadhouitanosehohomouthhuaichinhaidaiekiearkinoleoeyelashoitkaneckkimataarmnariguichestongotainihandonokuifingernokainailonohaicouleggrasifootetaiboidogarricoujaguarhucohousehuahosnaketaïbowotabiarrowotakispearruinacanoearatayparrotarumbafireraiheucaimansanguinimamoehugaibananatitsablowgunoniamonkeyamaifishjadobimanateeisetimaheartponaikioutapirigataimanmacawcorakicurassowmiukiflowersarirakirivermaragnonPourouma cecropiifoliaricaoAmazon RiverNamani The term was also applied to the name of the river they lived on.

In popular culture In Steven Spielberg's film Indiana Jones and the Kingdom of the Crystal Skull (2008), Indiana Jones identifies the Koihoma language on a mysterious letter Harold Oxley wrote. However, he explains to Mutt Williams that nobody speaks that language anymore. He defines it as a "Latin American language" that became extinct centuries before Spanish and Portuguese were introduced to the Americas.

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