Medical Dictionary
6 ENTRIES FOUND:

onset

noun on·set \ˈn-ˌset, ˈän-\

Definition of ONSET

:  the initial existence or symptoms of a disease <the onset of scarlet fever>
March 29, 2015
discomfit Hear it
To thwart or disconcert
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