noun Pharmacology.

  1. a synthetic yellow crystalline powder, C11H8O2, insoluble in water, used as a vitamin K supplement.


  1. a yellow crystalline compound used in fungicides and as an additive to animal feeds. Formula: C 11 H 8 O 2Also: vitamin K 3


  1. A synthetic vitamin K derivative occurring as a yellow crystalline powder and used as a vitamin K supplement.

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