soda

the word 'soda' entered english in the late 15th century from italian, where 'soda' referred to a type of saltwort plant whose ashes were used in making glass. the italian term likely derived from medieval latin 'soda', which itself may have an arabic origin, from 'suwwād', referring to similar saltwort plants. the key semantic shift occurred because the ashes of these plants were rich in sodium carbonate, leading to the chemical name. the modern meaning of a carbonated beverage arose in the 19th century, originally short for 'soda-water', which was water charged with carbon dioxide using sodium bicarbonate.

the word is a simplex loanword. it does not contain separable morphemes within its modern english spelling.