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valves


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Semilunar  \Sem`i*lu"nar\,  a. 
  Shaped  like  a  half  moon. 
 
  {Semilunar  bone}  (Anat.),  a  bone  of  the  carpus;  the  lunar. 
  See  {Lunar},  n. 
 
  {Semilunar},  or  {Sigmoid},  {valves}  (Anat.),  the  valves  at 
  the  beginning  of  the  aorta  and  of  the  pulmonary  artery 
  which  prevent  the  blood  from  flowing  back  into  the 
  ventricle. 




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