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The Collaborative International Dictionary
Cephalometry

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.] ||

Wiktionary
cephalometry

n. The measurement of the skull, especially in order to study its growth and development

Wikipedia
Cephalometry

Cephalometry is the study and measurement of the head, usually the human head, especially by medical imaging such as radiography. Craniometry, the measurement of the cranium ( skull), is a large subset of cephalometry. Cephalometry also has a history in Phrenology, which is the study of personality and character as well as Physiognomy, which is the study of facial features. Cephalometry as applied in a comparative anatomy context informs biological anthropology. In clinical contexts such as dentistry and oral and maxillofacial surgery, cephalometric analysis helps in treatment and research; cephalometric landmarks guide surgeons in planning and operating.