资料来源 : Webster's Revised Unabridged Dictionary (1913)

Ravehook \Rave"hook\, n. (Shipbuilding)
   A tool, hooked at the end, for enlarging or clearing seams
   for the reception of oakum.

资料来源 : WordNet®

ravehook
     n : a hooked hand tool used to prepare the seams of a boat for
         oakum