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umbonesmore about umbones

umbones


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Umbo  \Um"bo\,  n.;  pl  L.  {Umbones},  E.  {Umbos}.  [L.] 
  1.  The  boss  of  a  shield,  at  or  near  the  middle,  and  usually 
  projecting,  sometimes  in  a  sharp  spike. 
 
  2.  A  boss,  or  rounded  elevation,  or  a  corresponding 
  depression,  in  a  palate,  disk,  or  membrane;  as  the  umbo 
  in  the  integument  of  the  larv[ae]  of  echinoderms  or  in  the 
  tympanic  membrane  of  the  ear. 
 
  3.  (Zo["o]l.)  One  of  the  lateral  prominence  just  above  the 
  hinge  of  a  bivalve  shell. 




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