Why was "tantrum" trending last week?
late 15c., "sodium carbonate," an alkaline substance extracted from certain ashes (now made artificially), from Italian sida (or Medieval Latin soda) "a kind of saltwort," from which soda was obtained, of uncertain origin. Perhaps it is 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. Another theory traces it to Medieval Latin sodanum "a headache remedy," ultimately from Arabic suda "splitting headache."
Soda is found naturally in alkaline lakes, in deposits where such lakes have dried, and from ash produced by burning various seaside plants. Since commercial manufacture of it began in France in late 18c., these other sources have been abandoned. Washing soda (sodium carbonate) is commonly distinguished from baking soda (sodium bicarbonate). A soda-cracker (1863) has baking soda as an ingredient.
The meaning "carbonated water" is first recorded 1834, a shortening of soda water (1802) "water into which carbonic acid has been forced under pressure." "It rarely contains soda in any form; but the name originally applied when sodium carbonate was contained in it has been retained" [Century Dictionary, 1902]. Since 19c. typically flavored and sweetened with syrups. First record of soda pop is from 1863, and the most frequent modern use of the word is as a shortening of this or other terms for "flavored, sweetened soda water." Cf. pop (n.1). Soda fountain is from 1824; soda jerk first attested 1922 (soda-jerker is from 1883). Colloquial pronunciation "sody" is represented in print from 1900 (U.S. Midwestern).
soda so·da (sō'də)
Any of various forms of sodium carbonate.
Chemically combined sodium.