diastasis

from WordNet (r) 3.0 (2006)
diastasis
    n 1: separation of an epiphysis from the long bone to which it
         is normally attached without fracture of the bone
    
from The Collaborative International Dictionary of English v.0.48
Diastasis \Di*as"ta*sis\, n. [NL. See {Diastase}.] (Surg.)
   A forcible separation of bones without fracture.
   [1913 Webster]
    

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