Why “crepitus” is a great word
A grating, crackling, or popping sound or sensation produced under the skin or within a joint. From Latin crepitus ("a rattling, creaking, crackling sound"), from the verb crepāre ("to crack, creak, rattle"), first attested in English c. 1820. Unlike the single, clean report of a "snap" or the fine, repetitive crackling of "crepitation" in a troubled lung, crepitus is the broader, more intimate murmur of the body's architecture wearing down. It is the dry-rice sound beneath a kneecap on a descent of stairs, the unsettling grate of broken bone ends touching, and the low, private fireworks of a spine uncurling after hours at a desk—the audible proof that we are, in our durable frames, perpetually coming gently apart.