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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hyporhachis  \Hy`po*rha"chis\,  n.;  pl  {Hyporhachides}.  [NL.,  fr 
  Gr  "ypo`  beneath  +  ?  spine.]  (Zo["o]l.) 
  The  stem  of  an  aftershaft  or  hypoptilum.  [Written  also