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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Ephippium  \E*phip"pi*um\,  n.  [L.,  saddle  cloth,  fr  Gr  ?;  'epi` 
  on  +  ?  horse.] 
  1.  (Anat.)  A  depression  in  the  sphenoid  bone;  the  pituitary 
  2.  (Zo["o]l.)  A  saddle-shaped  cavity  to  contain  the  winter 
  eggs,  situated  on  the  back  of  Cladocera.