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

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

But millions have been left without light, water or heat as winter sets in.

From BBC ● Nov. 25, 2022

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

From New York Times ● Mar. 7, 2022

By habit is meant the requirements of the trees for light, water and food.

From Studies of Trees by Jacob Joshua Levison