An Indian of the tribe from which the Tupian stock takes its name, dwelling, at the advent of the Portuguese, about the mouth of the Amazon. Also, their language, which is the basis of the Indian trade language of the Amazon. [Webster 1913 Suppl.]
tupi, n. & adj.
--n. (pl. same or Tupis)
1 a member of an American Indian people native to the Amazon valley.
2 the language of this people.
--adj. of or relating to this people or language.