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  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Centerboard  \Cen"ter*board`\,  Centreboard  \Cen"tre*board\,,  n. 
  (Naut.) 
  A  movable  or  sliding  keel  formed  of  a  broad  board  or  slab  of 
  wood  or  metal  which  may  be  raised  into  a  water-tight  case 
  amidships,  when  in  shallow  water,  or  may  be  lowered  to 
  increase  the  area  of  lateral  resistance  and  prevent  leeway 
  when  the  vessel  is  beating  to  windward.  It  is  used  in  vessels 
  of  all  sizes  along  the  coast  of  the  United  States 
 
  From  WordNet  r  1.6  [wn]: 
 
  centreboard 
  n  :  a  retractable  fin  keel  used  on  sailboats  to  prevent  drifting 
  to  leeward  [syn:  {centerboard},  {drop  keel},  {sliding 
  keel}] 

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