I. ˈdōs noun
Etymology: Middle English, from Middle French, from Late Latin dosis, from Greek, literally, act of giving, from didonai to give — more at date
Date: 15th century
1.
a. : the measured quantity of a therapeutic agent to be taken at one time
b. : the quantity of radiation administered or absorbed
2. : a portion of a substance added during a process
3. : an amount of something likened to a prescribed or measured quantity of medicine
a daily dose of hard work
a dose of scandal
4. : a gonorrheal infection
II. transitive verb
( dosed ; dos·ing )
Date: 1654
1. : to give a dose to ; especially : to give medicine to
2. : to divide (as a medicine) into doses
3. : to treat with an application or agent