The Collaborative International Dictionary of English v.0.48:

Scaphoid \Scaph"oid\ (?; 277), a. [Gr. ska`fh a boat + -oid: cf.
   F. scapho["i]de.] (Anat.)
   Resembling a boat in form; boat-shaped. -- n. The scaphoid
   bone.
   [1913 Webster]

   Scaphoid bone
   (a) One of the carpal bones, which articulates with the
       radius; the radiale.
   (b) One of the tarsal bones; the navicular bone. See under
       Navicular.
       [1913 Webster]

WordNet (r) 3.0 (2006):

scaphoid bone
    n 1: the largest wrist bone on the thumb side [syn: scaphoid
         bone, os scaphoideum, navicular]