Relating to or involving goniometry, the measurement of angles, especially those formed by bones or joints in medical anatomy.
From Greek 'gonia' (angle) plus 'metron' (measure). This medical term emerged in the 19th century as doctors developed better ways to measure joint movement and alignment.
Physical therapists use goniometers (angle-measuring tools) to see exactly how far you can bend your knee or shoulder—it's basically a medical protractor for your body!
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