Source : Webster's Revised Unabridged Dictionary (1913)

Hollow \Hol"low\, v. t. [imp. & p. p. {Hollowed}; p. pr. & vb.
   n. {Hollowing}.]
   To make hollow, as by digging, cutting, or engraving; to
   excavate. ``Trees rudely hollowed.'' --Dryden.

Source : WordNet®

hollowed
     adj : having a cavity within; "canoe made of a hollowed log"