Definify.com
Webster 1913 Edition
Underdose
Un′der-doseˊ
,Noun.
A dose which is less than required; a small or insufficient dose.
Unˊder-dose′
,Verb.
T.
& I.
To give an underdose or underdoses to; to practice giving insufficient doses.
Webster 1828 Edition
Underdose
UN'DERDOSE
,Noun.