- The root of compounds that are 3-multiprenyl derivatives of m. and known as the menaquinones or vitamins K2. SYN: menaphthone, vitamin K3.- m. sodium bisulfite it possesses the same action and is used for the same purposes as m. or vitamin K; it differs, however, from m. in being water-soluble.
* * *men·a·di·one .men-ə-'dī-.ōn, -dī-' n a yellow crystalline compound C11H8O2 with the biological activity of natural vitamin K called also vitamin K3
* * *men·a·di·one (men″ə-diґōn) vitamin K3. 1. [USP] a synthetic fat-soluble provitamin that can be chemically converted in the body to active vitamin K by addition of a long side chain; used as a source of vitamin K in the treatment of hypoprothrombinemia associated with vitamin K deficiency, as occurs in hepatic or biliary disease and malabsorption syndromes, or after administration of salicylates, anticoagulants, or certain antibiotics; administered orally or intramuscularly. 2. the basic double ring quinone structure that is the parent structure of the related compounds with vitamin K activity, which can be formed by addition of long side chain substituents.
Medical dictionary. 2011.