The Collaborative International Dictionary
Oncometer
Oncometer \On*com"e*ter\, n. [Gr. ? bulk + -meter.] (Physiol.) An instrument for measuring the variations in size of the internal organs of the body, as the kidney, spleen, etc.
Wiktionary
oncometer
n. (context physiology English) An instrument for measuring the variations in size of the internal organs of the body.