Laura,
I think the word is "Jointerhouse".
If you Google it, the word is used elsewhere, but appears to be archaic, and not found in many up to date dictionaries (except perhaps the OED).
However the word "Jointure" is currently in use, and defined as follows :-
Jointure
a. provision made by a husband for his wife by settling property upon her at marriage for her use after his death
b. the property so settled.
It would seem appropriate therefore to identify what the property was, eg land, livestock etc, or in this case, a house. - Jointure house, or Jointerhouse.
I agree with Looby that a search through the OPR's might help identify the location of the property, failing which, if a will made by your ancestor was registered, a copy of it may lie within the records held at Scotland's People.
Good luck with your search.
Istrice
