Salsa

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Spanish, literally ‘sauce’, extended in American Spanish to denote the dance.

wiktionary

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Borrowed from Spanish salsa(“sauce”), from Latin salsus(“salted”), whence also the doublet sauce (via Old French).

etymonline

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salsa (n.)

kind of sauce, 1846; kind of dance music, 1975, from Spanish, literally "sauce," from Vulgar Latin *salsa "condiment" (see sauce (n.)). In American Spanish especially used of a kind of relish with chopped-up ingredients; the music so called from its blend of Latin jazz and rock styles.