The word 'tapir' entered English in the late 18th century from Portuguese, which borrowed it from the Tupi language of Brazil, where 'tapira' or 'tapyra' referred to the animal. The Tupi term is believed to be related to words meaning 'thick' in reference to the animal's hide. As a loanword, its form was adopted whole into English without internal morphological segmentation, serving as the direct name for this distinctive, trunk-nosed mammal. Its journey from a specific indigenous term to a standardized zoological name exemplifies how local fauna are named in global scientific vocabulary.

The word 'tapir' is a simplex loanword from the Tupi language of Brazil, via Portuguese. It does not contain separable morphemes within English.