Inflammation of the joints of the clavicle (collarbone), particularly the sternoclavicular or acromioclavicular joints.
From Greek 'kleido-' (clavicle) plus '-arthritis' (joint inflammation, from 'arthron' meaning joint plus '-itis' meaning inflammation). This is a precise medical term created from classical Greek morphemes.
Cleidarthritis is so specific that it's almost never used in casual conversation—doctors usually just say 'collarbone joint pain'—yet these hyper-precise Latin-Greek terms allow medical professionals to pack complex anatomical information into a single word, creating efficiency at the cost of accessibility.
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