noun, feminine/sud/plural: soudes
soda, lye, sodium hydroxide (NaOH); sodium (Na); sodium carbonate (Na₂CO₃); seepweed, sea blite, saltwort (plants, usually of the genus Suaeda, which produce sodium carbonate when burned); prickly saltwort (Salsola kali, syn. Kali turgidum)
Synonyms: hydroxyde de sodium, soude caustique, soude brûlée
Inherited from Middle French soude, soulde, around 1500 from Italian soda.