alkali
/ˈælkəlaɪ/noun
(pl.alkalis)
1- a compound with particular chemical properties including turning litmus blue and neutralizing or effervescing with acids; typically, a caustic or corrosive substance of this kind such as lime or soda
1.1
- as modifier chiefly N. Amer. alkaline〈主北美〉碱的。
Alkalis release hydroxide ions （OH-） when dissolved in water. Any solution with a pH of more than 7 is alkaline.
词源
late Middle English （denoting a saline substance derived from the ashes of various plants， including glasswort）： from medieval Latin， from Arabic alḳali. 'calcined ashes （of the glasswort etc.）'， from ḳalā 'fry， roast'.