Source : Webster's Revised Unabridged Dictionary (1913)

Garboard \Gar"board\, n. (Naut.)
   One of the planks next the keel on the outside, which form a
   garboard strake.

   {Garboard strake} or {streak}, the first range or strake of
      planks laid on a ship's bottom next the keel. --Totten.

Source : WordNet®

garboard
     n : the first wale laid next to the keel of a wooden ship [syn:
         {garboard plank}, {garboard strake}]