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  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Heliotrope  \He"li*o*trope\,  n.  [F.  h['e]liotrope,  L. 
  heliotropium,  Gr  ?;  ?  the  sun  +  ?  to  turn,  ?  turn.  See 
  {Heliacal},  {Trope}.] 
  1.  (Anc.  Astron.)  An  instrument  or  machine  for  showing  when 
  the  sun  arrived  at  the  tropics  and  equinoctial  line 
  2.  (Bot.)  A  plant  of  the  genus  {Heliotropium};  --  called  also 
  {turnsole}  and  {girasole}.  {H.  Peruvianum}  is  the  commonly 
  cultivated  species  with  fragrant  flowers. 
  3.  (Geodesy  &  Signal  Service)  An  instrument  for  making 
  signals  to  an  observer  at  a  distance,  by  means  of  the 
  sun's  rays  thrown  from  a  mirror. 
  4.  (Min.)  See  {Bloodstone} 
  a  . 
  {Heliotrope  purple},  a  grayish  purple  color.