charterhouse

from WordNet (r) 3.0 (2006)

charterhouse
    n 1: a Carthusian monastery

from The Collaborative International Dictionary of English v.0.48

Charterhouse \Char"ter*house`\, n.
   A well known public school and charitable foundation in the
   building once used as a Carthusian monastery (Chartreuse) in
   London.
   [1913 Webster]