From The Collaborative International Dictionary of English v.0.48:

Ureameter \U`re*am"e*ter\, n. [Urea + -meter.] (Physiol. Chem.)
   An apparatus for the determination of the amount of urea in
   urine, in which the nitrogen evolved by the action of certain
   reagents, on a given volume of urine, is collected and
   measured, and the urea calculated accordingly.
   [1913 Webster]
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