The Collaborative International Dictionary of English v.0.48:

Spoor \Spoor\ (sp[=oo]r), n. [D. spoor; akin to AS. spor, G.
   spur, and from the root of E. spur. [root]171. See Spur.]
   The track or trail of any wild animal; as, the spoor of an
   elephant; -- used originally by travelers in South Africa.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spoor \Spoor\, v. i.
   To follow a spoor or trail. [R.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

spoor
    n 1: the trail left by a person or an animal; what the hunter
         follows in pursuing game; "the hounds followed the fox's
         spoor"