“Tupian Languages: Family of South American Indian languages with at least seven subgroups, spoken or formerly spoken in scattered areas from south French Guiana south to southernmost Brazil and Paraguay and east to eastern Bolivia. About a third of the estimated 37 known Tupian languages are extinct. The largest subgroup, Tupi-Guarani, includes the extinct language Tupinamba, the source for borrowings of many New World flora and fauna terms into Portuguese and hence other European languages. Another language of the subgroup, Guarani, is spoken as a first or second language by more than 90 percent of Paraguayans, who consider it a token of Paraguayan identity.”
Excerpted from: Stevens, Mark A., Ed. Merriam-Webster’s Collegiate Encyclopedia. Springfield, Massachusetts: Merriam-Webster, 2000.