haematometer

from The Collaborative International Dictionary of English v.0.48

Haematometer \H[ae]m`a*tom"e*ter\ (-t[o^]m"[-e]*t[~e]r), n.
   [H[ae]mato- + -meter.] (Physiol.)
   (a) Same as {Hemadynamometer}.
   (b) An instrument for determining the number of blood
       corpuscles in a given quantity of blood.
       [1913 Webster]