seawater

noun

sea·​wa·​ter ˈsē-ˌwȯ-tər 

-ˌwä-

: water in or from the sea

Examples of seawater in a Sentence

Recent Examples on the Web

So instead of getting magnesium that has been smelted via the Pidgeon process, Lola extracts the stuff from seawater via electrolysis, powered by solar. — Jonathan M. Gitlin, ArsTechnica, 7 July 2026

Managing scarcity through digital modeling While deuterium is highly abundant and easily extracted from standard seawater, tritium is exceedingly scarce in nature. — Aman Tripathi, Interesting Engineering, 5 July 2026

Barnacles, mussels, clams, algae and other warm-seawater-dwelling fauna and flora have latched onto oil tankers hundreds of massive oil tankers anchored in the Persian Gulf over the past several months. — David Goldman, CNN Money, 23 June 2026

Fresh water density is 1,000 kg/m3 (with only slight temperature changes), while seawater weighs 1,026 kg/ m3—but densities of aquatic organisms are higher and adaptations are needed to achieve buoyancy. — Literary Hub, 22 June 2026

Word History

First Known Use

before the 12th century, in the meaning defined above

Rhymes for seawater

• backwater
• bathwater
• blackwater
• breakwater
• deepwater
• edgewater
• feedwater
• floodwater
• freshwater
• granddaughter
• groundwater
• headwater

Kids Definition

seawater

noun

sea·​wa·​ter ˈsē-ˌwȯt-ər 

-ˌwät-

: water in or from the sea