Chemistry An inert substance used to dilute.(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.
Use "diluent" in a sentence
"This error, instead of diminishing, has increased: most valetudinarians are now of opinion that a thick blood is the sole cause of their complaints; with this impression they adopt what they call the diluent beverage of India teas."
"So we need another gas, something to dilute the oxygen with and that, fittingly enough, is called the diluent gas supply."
"Ratio describes the amount of the substance compared to the amount of the diluent (water, oil, alcohol, etc):"