arugula

the word 'arugula' entered american english in the 20th century, borrowed from a southern italian dialectal variant 'arucula'. this, in turn, derives from the latin 'eruca', which referred to a type of colewort or arugula plant. the latin term is believed to have possible pre-latin, perhaps etruscan, origins. the british english equivalent 'rocket' follows a different etymological path from the same latin source via old french 'roquette', illustrating how the same plant acquired distinct names through different channels of linguistic borrowing.

this word is a loanword adopted as a single unit into english; it does not contain separable morphemes within its current english spelling.