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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Evolute  \Ev"o*lute\,  n.  [L.  evolutus  unrolled,  p.  p.  of 
  evolvere  See  {Evolve}.]  (Geom.) 
  A  curve  from  which  another  curve,  called  the  involute  or 
  evolvent,  is  described  by  the  end  of  a  thread  gradually  wound 
  upon  the  former,  or  unwound  from  it  See  {Involute}.  It  is 
  the  locus  of  the  centers  of  all  the  circles  which  are 
  osculatory  to  the  given  curve  or  evolvent. 
  Note:  Any  curve  may  be  an  evolute,  the  term  being  applied  to 
  it  only  in  its  relation  to  the  involute.