The Collaborative International Dictionary of English v.0.48:

Cephalometry \Ceph`a*lom"e*try\, n. (Anthropometry)
   The measurement of the heads of living persons. --
   Ceph`a*lo*met"ric,a.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

cephalometry
    n 1: measurement of human heads