An instrument used to measure the head and skull, particularly for standardized orthodontic and anthropometric measurements.
From Greek kephalē (head) + -meter (measure, measuring instrument). Developed in the early 20th century as orthodontics and anthropology required precise, repeatable measurements.
A cephalometer is basically a measuring ruler for your head—it holds your head in exact positions so doctors can take identical measurements over years, tracking how your jaw and face develop and whether orthodontic treatment is working.
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