1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Mastax  \Mas"tax\,  n.  [NL.,  fr  Gr  ?  mouth,  jaws.]  (Zo["o]l.) 
  a  The  pharynx  of  a  rotifer.  It  usually  contains  four  horny 
  pieces.  The  two  central  ones  form  the  incus,  against 
  which  the  mallei,  or  lateral  ones,  work  so  as  to  crush 
  the  food. 
  b  The  lore  of  a  bird. 

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