aqueous

adjective

aque·​ous ˈā-kwē-əs  ˈa- 

1

a

: of, relating to, or resembling water

b

: made from, with, or by water

an aqueous solution

2

medical : of or relating to the aqueous humor

Examples of aqueous in a Sentence

Recent Examples on the Web

Researchers in South Korea have developed a new electrolyte additive that significantly improves the lifespan and capacity of aqueous batteries, a technology widely viewed as a safer and lower-cost alternative to lithium-ion batteries. —Neetika Walter, Interesting Engineering, 10 June 2026

Firefighters across the country filed a class-action lawsuit alleging cancer and other serious health conditions caused by aqueous film-forming foam (AFFF), which contains PFAS and is expelled from fire extinguishers. —John F. McQuillan, Forbes.com, 13 May 2026

The aqueous action scenes — cascades of water swirling around aerial charges — should play out nicely on the big screen during the film’s theatrical release. —Beatrice Loayza, Variety, 1 May 2026

Kirill Vasin’s releases as Hoavi have tended toward the aqueous. —Sam Goldner, Pitchfork, 13 Apr. 2026

Word History

Etymology

Medieval Latin aqueus, from Latin aqua

First Known Use

1646, in the meaning defined at sense 1a

Phrases Containing aqueous

• aqueous humor

Rhymes for aqueous

• nonaqueous
• subaqueous

Kids Definition

aqueous

adjective

aque·​ous ˈā-kwē-əs  ˈak-wē- 

1

a

: of, relating to, or resembling water

b

: made from, by, or with water

an aqueous solution

2

: of or relating to the aqueous humor

Medical Definition

aqueous

1 of 2 adjective

aque·​ous ˈā-kwē-əs  ˈak-wē- 

1

a

: of, relating to, or resembling water

an aqueous vapor

b

: made from, with, or by water

an aqueous solution

2

: of or relating to the aqueous humor

aqueous

2 of 2 noun

: aqueous humor