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menadione

[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.
Also called vitamin K3.
Origin of menadione
1940-1945
First recorded in 1940-45; me(thyl) + na(phthalene) + di-1 + -one
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for menadione

menadione

/ˌmɛnəˈdaɪəʊn/
noun
1.
a yellow crystalline compound used in fungicides and as an additive to animal feeds. Formula: C11H8O2 Also vitamin K3
Word Origin
C20: from me(thyl) + na(phtha) + di-1 + -one
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
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menadione in Medicine

menadione men·a·di·one (měn'ə-dī'ōn')
n.
A synthetic vitamin K derivative occurring as a yellow crystalline powder and used as a vitamin K supplement.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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