Medical Dictionary

unofficial

adj un·of·fi·cial \ˌən-ə-ˈfish-əl\

Definition of UNOFFICIAL

:  not official; specifically :  of, relating to, or being a drug not described in the United States Pharmacopeia and National Formulary—compare nonofficial, official
April 01, 2015
diapause Hear it
a period of physiological dormancy
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears