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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hyperthyrion  \Hy`per*thyr"i*on\,  n.  [NL.,  fr  Gr  ?;  "ype`r  over 
  +  ?  door.]  (Arch.) 
  That  part  of  the  architrave  which  is  over  a  door  or  window.