Crepitation \Crep`i*ta"tion\ (kr?p`?-t?"sh?n), n. [Cf. F. cr['e]pitation.]

1. The act of crepitating or crackling.

2. (Med.)
   (a) A grating or crackling sensation or sound, as that produced by rubbing two fragments of a broken bone together, or by pressing upon cellular tissue containing air.
   (b) A crepitant r[^a]le.

Source: Webster's Revised Unabridged Dictionary (1913)