The Collaborative International Dictionary of English v.0.48:

Shin \Shin\, n. [OE. shine, schine, AS. scina; akin to D.
   scheen, OHG. scina, G. schiene, schienbein, Dan. skinnebeen,
   Sw. skenben. Cf. Chine.]
   1. The front part of the leg below the knee; the front edge
      of the shin bone; the lower part of the leg; the shank.
      "On his shin." --Chaucer.
      [1913 Webster]

   2. (Railbroad) A fish plate for rails. --Knight.
      [1913 Webster]

   Shin bone (Anat.), the tibia.

   Shin leaf (Bot.), a perennial ericaceous herb (Pyrola
      elliptica) with a cluster of radical leaves and a raceme
      of greenish white flowers.
      [1913 Webster]

WordNet (r) 3.0 (2006):

shin bone
    n 1: a cut of meat from the lower part of the leg [syn: shin,
         shin bone]
    2: the inner and thicker of the two bones of the human leg
       between the knee and ankle [syn: tibia, shinbone, shin
       bone, shin]