Definition of "heavy water" []

• Any of several isotopic forms of water, especially deuterium oxide, that consists chiefly of molecules containing heavy hydrogen and is used as a moderator in certain nuclear reactors. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "But it was Likari who unshouldered the heavy water skin he had been carrying."
• "Stolen warheads for the Moluccans, heavy water for the Albanians, poisoned bird poo for the Lakota?"