osmometry

from The Collaborative International Dictionary of English v.0.48

Osmometry \Os*mom"e*try\ ([o^]z"m[o^]m"[-e]*tr[y^] or
   [o^]s"m[o^]m"[-e]*tr[y^]), n. (Physics)
   The study of osmosis by means of the osmometer.
   [1913 Webster]