An alkaline battery.
"The old camera uses an alkaline battery to power its flash."
Of, or relating to an alkali, one of a class of caustic bases.
"The chemist tested the solution and confirmed it was alkaline by measuring its high pH level."
In plain English: Alkaline describes something that is basic and has a high pH level, making it feel slippery rather than sour or acidic.
"Baking soda is an alkaline substance often used to neutralize odors in the refrigerator."
Usage: Alkaline describes substances with a pH greater than 7 that feel slippery and taste bitter, such as baking soda or soap. Use this term specifically for basic solutions rather than neutral water or acidic liquids like lemon juice.
The word alkaline entered English in 1677 by combining "alkali" with the suffix "-ine." It traces its roots back to Arabic terms for ashes and frying, originally referring to substances made from roasted saltwort.