The Collaborative International Dictionary
Undermaster
Undermaster \Un"der*mas`ter\, n. A master subordinate to the principal master; an assistant master.
Wiktionary
undermaster
n. an assistant master; a subordinate to the main master
Usage examples of "undermaster".
The Undermaster was one of the few in the Font permitted to stay up during the Resting Time.
At that point he remembered the rats, and it struck the Undermaster rather forcibly that a rat large enough to make a sound heard from that distance must be an uncommonly large specimen of the species.
Eton undermasters, who, like Demetrius the Silversmith, seems alarmed for the gains of his occupation.