light water

American  

noun

1. ordinary water, as opposed to heavy water; water containing the normal proportion of deuterium oxide.

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light water British  

noun

1. a name for water (H 2 O), as distinct from heavy water

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light water Scientific  

1. Ordinary water, H ₂ O.

2. Compare heavy water

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Etymology

Origin of light water

First recorded in 1930–35

Example Sentences

See Examples For:

light water

The plants need reliable heat, light, water and nutrients, over many months.

From BBC ● May 14, 2026

Competition for light, water and nutrients immediately sets in.

From Los Angeles Times ● Mar. 13, 2026

"Understanding where, and how much, of that fresh and light water enters the Atlantic Ocean is critical to predict how the circulation may evolve under climate change," Duyck says.

From Science Daily ● Oct. 24, 2023

Nearly 1,000 towns and villages have been completely deprived of light, water and heat, he said.

From New York Times ● Mar. 7, 2022

I attributed my illness chiefly to bad water, previous experience having taught me that my constitution is very susceptible of the want of good light water, that prime article of life in eastern countries.

From Travels in Arabia; comprehending an account of those territories in Hedjaz which the Mohammedans regard as sacred by Burckhardt, John Lewis