Dictionary.com
Thesaurus.com
Showing results for H2O. Search instead for HLO.
Synonyms

H2O

Cultural  

  1. The chemical symbol (see also symbol) for water. Each molecule of water contains two atoms of hydrogen (H) joined to a single atom of oxygen (O).

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

H2O is the stuff of life, but for several decades, water producers and sommeliers have been working to make it something more: the stuff of taste.

From The Wall Street Journal • Oct. 20, 2025

Over the course of 40-day laboratory experiments involving dehydration, the scientists learned that ferrihydrite loses some absorbed H2O while maintaining its poorly-crystalline structure.

From Salon • Mar. 1, 2025

He has denied the existence of Covid, questioned the moon landing and claims that water is something other than H2O.

From BBC • Dec. 10, 2024

The business of boosting one’s H2O is projected to reach $3.26 billion by 2031.

From Los Angeles Times • Jul. 22, 2024

Later, for no special reason, the fashion became to render the number as subscript: H2O.

From "A Short History of Nearly Everything" by Bill Bryson

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.