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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hypotrochoid  \Hy`po*tro"choid\,  n.  [Pref.  hypo-  +  trochoid.] 
  A  curve,  traced  by  a  point  in  the  radius,  or  radius  produced, 
  of  a  circle  which  rolls  upon  the  concave  side  of  a  fixed 
  circle.  See  {Hypocycloid},  {Epicycloid},  and  {Trochoid}.