WASHOE By N., Pam M.S. - April 29, 2013 noun. the first chimpanzee to learn to correspond with others by utilizing the American sign language. WASHOE: "Washoe was a female chimpanzee who effectively learned to communicate via American sign language. " Related Psychology Terms AMESLAN MIMETIC SIGN LANGUAGE SIGN I SOURCE LANGUAGE FINGER SPELLING ADDITIVE BILINGUALISM TELECOMMUTING OVERACTIVITY YERKISH Cite this page: N., Pam M.S., "WASHOE," in PsychologyDictionary.org, April 29, 2013, https://psychologydictionary.org/washoe/ (accessed February 18, 2019).