alkaline

adjective

al·​ka·​line ˈal-kə-lən  -ˌlīn 

: of, relating to, containing, or having the properties of an alkali or alkali metal : basic

especially, of a solution : having a pH of more than 7

alkalinity

ˌal-kə-ˈli-nə-tē 

noun

Examples of alkaline in a Sentence

Recent Examples on the Web

Take As An Antacid Baking soda is very alkaline and can be used to neutralize stomach acid on occasion. —Brandee Gruener, Southern Living, 12 Dec. 2025

SulfurSolve aims to avoid inefficiencies by using chemically stable carbonate ions to keep iron soluble and reactive at alkaline pH levels. —Sixteen Ramos, USA Today, 3 Nov. 2025

Lastly, alkaline water electrolysis (AWE) has been a reliable workhorse in the industry. —Kapil Kajal, Interesting Engineering, 17 Sep. 2025

The hardened sediment largely contained the mineral brucite — created through alkaline waste interacting with magnesium in the ocean water that resulted in the crust-like surface surrounding the barrels. —Maura Fox, San Diego Union-Tribune, 11 Sep. 2025

Word History

First Known Use

1682, in the meaning defined above

Phrases Containing alkaline

• alkaline battery
• alkaline earth metal
• alkaline hydrolysis
• alkaline phosphatase

Rhymes for alkaline

• acridine
• andesine
• anodyne
• anticline
• arginine
• asinine
• atropine
• benzidine
• borderline
• byzantine
• calamine
• caroline

Kids Definition

alkaline

adjective

al·​ka·​line ˈal-kə-lən  -ˌlīn 

: of, relating to, or having the characteristics of an alkali : basic

alkalinity

ˌal-kə-ˈlin-ət-ē 

noun

Medical Definition

alkaline

adjective

al·​ka·​line ˈal-kə-lən  -ˌlīn 

: of, relating to, containing, or having the properties of an alkali or alkali metal : basic

especially, of a solution : having a pH of more than 7

alkalinity

ˌal-kə-ˈlin-ət-ē 

noun

plural alkalinities