1. Plural of alkali; substances that are bitter, slippery, and turn red litmus paper blue, and react with acids to form salts.
Usage: Chemistry term; Plural form

Examples

• Sodium hydroxide and potassium hydroxide are common alkalis used in laboratories.
• The alkalis in the cleaning solution help break down grease and dirt.
• When alkalis mix with acids, they neutralize each other and produce water and salt.
• Baking soda is one of the milder alkalis found in household products.
• The chemist tested several alkalis to determine their pH levels.