rumba

the word 'rumba' entered english in the early 20th century from american spanish, where it referred to a festive party or dance. its ultimate origin is believed to be west african, possibly from the kikongo word 'nkumba', meaning 'belly button', a term associated with a type of dance. the term traveled to the caribbean through the transatlantic slave trade, evolving in cuba to denote a specific genre of music and dance that syncretized african rhythms with spanish influences. when adopted into english, it lost its original linguistic components and became a simplex term for the art form itself.

this word is a loanword adopted as a single, unanalyzable unit in english. it does not contain separable morphemes from the perspective of english word formation.