H2O

noun
\ ˈāch-ˈtü-ˈō How to pronounce H{inf}2{/inf}O (audio) \

Definition of H2O

: water sense 1a American lawns and gardens drink up H2O at alarming rates, especially in the dry West, where more than 50% of residential water is used for landscaping.— Bryan Walsh

First Known Use of H2O

1879, in the meaning defined above

Keep scrolling for more

Learn More About H2O

Dictionary Entries Near H2O

h

H

H2

H2O

H3

ha

HA

See More Nearby Entries 

Statistics for H2O

Cite this Entry

“H2O.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/H2O. Accessed 18 Jun. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Name that Thing: Dog Breeds

True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!