Source : Webster's Revised Unabridged Dictionary (1913)

Pelvimeter \Pel*vim"e*ter\, n. [Pelvis + -meter.: cf. F.
   pelvim[`e]tre.]
   An instrument for measuring the dimensions of the pelvis.
   --Coxe.

Source : WordNet®

pelvimeter
     n : measuring instrument for performing pelvimetry