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menadione

American  
[men-uh-dahy-ohn] / ˌmɛn əˈdaɪ oʊn /

noun

Pharmacology.

  1. a synthetic yellow crystalline powder, C 1 1 H 8 O 2 , insoluble in water, used as a vitamin K supplement.

menadione British  
/ ˌmɛnəˈdaɪəʊn /

noun

  1. Also: vitamin K3.  a yellow crystalline compound used in fungicides and as an additive to animal feeds. Formula: C 11 H 8 O 2

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of menadione

First recorded in 1940–45; me(thyl) + na(phthalene) + di- 1 + -one

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.