the word 'stupa' entered english in the late 18th century, borrowed directly from the sanskrit term 'stūpaḥ', meaning a heap or mound. in sanskrit, it is derived from the root 'stūp-' or 'stu-', which carries the sense of piling up or raising aloft. this ancient term was used to describe the traditional burial mounds in india, which were later adopted and ritualized in buddhism as sacred reliquaries. the architectural and religious concept traveled with the spread of buddhism from india to other parts of asia, and the sanskrit word itself was adopted into english by scholars to denote this specific, culturally significant structure.

the word is a loanword from sanskrit, adopted as a whole into english.