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):

Pyrola elliptica
    n 1: North American evergreen with small pinkish bell-shaped
         flowers and oblong leaves used formerly for shinplasters
         [syn: wild lily of the valley, shinleaf, Pyrola
         elliptica]