housemaster

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A male teacher or professor in charge of a residence hall at a school or college.

from The Century Dictionary.

• noun The master or head of a house or household.
• noun In English public schools, a master having supervision and control of the boys residing in one of the houses or halls belonging to the school.

from the GNU version of the Collaborative International Dictionary of English.

• noun A teacher in charge of a school boardinghouse.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A teacher who is in charge of a house at a boarding school

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun teacher in charge of a school boardinghouse