1471, "alkaline substance," from It. sida (or M.L. soda) "a kind of saltwort," from which soda is obtained, probably from Arabic suwwad, the name of a variety of saltwort exported from North Africa to Sicily in the Middle Ages, related to sawad "black," the color of the plant. The meaning "carbonated water" is first recorded 1834, a shortening of soda water (1802). Soda fountain is from 1824; soda jerk first attested 1883. First record of soda pop is from 1873.