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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hypostome  \Hy"po*stome\,  Hypostoma  \Hy*pos"to*ma\,  n.  [NL. 
  hypostoma,  fr  Gr  "ypo`  beneath  +  ?  mouth.]  (Zo["o]l.) 
  The  lower  lip  of  trilobites,  crustaceans,  etc