H2O

noun \ ˈāch-ˈtü-ˈō \

Definition of H2O

:water 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 h{inf}2{/inf}o

1879


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