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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Helioscope  \He"li*o*scope\,  n.  [Helio-  +  -scope:  cf  F. 
  h['e]lioscope.]  (Astron.) 
  A  telescope  or  instrument  for  viewing  the  sun  without  injury 
  to  the  eyes,  as  through  colored  glasses,  or  with  mirrors 
  which  reflect  but  a  small  portion  of  light.  -- 
  {He`li*o*scop`ic},  a.