browse words by letter
a b c d e f g h i j k l m n o p q r s t u v w x y z
epicycle

more about epicycle

epicycle


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Epicycle  \Ep"i*cy`cle\,  n.  [L.  epicyclus  Gr  ?;  'epi`  upon  +  ? 
  circle.  See  {Cycle}.] 
  1.  (Ptolemaic  Astron.)  A  circle,  whose  center  moves  round  in 
  the  circumference  of  a  greater  circle;  or  a  small  circle, 
  whose  center,  being  fixed  in  the  deferent  of  a  planet,  is 
  carried  along  with  the  deferent,  and  yet  by  its  own 
  peculiar  motion,  carries  the  body  of  the  planet  fastened 
  to  it  round  its  proper  center. 
 
  The  schoolmen  were  like  astronomers  which  did  feign 
  eccentries  and  epicycles,  and  such  engines  of  orbs. 
  --Bacon. 
 
  2.  (Mech.)  A  circle  which  rolls  on  the  circumference  of 
  another  circle,  either  externally  or  internally. 
 
  From  WordNet  r  1.6  [wn]: 
 
  epicycle 
  n  :  a  circle  that  rolls  around  (inside  or  outside)  another 
  circle;  generates  an  epicycloid  or  hypocycloid 




more about epicycle