From WordNet (r) 2.0 (August 2003) [wn]:
footmark
n : a mark of a foot or shoe on a surface; "the police made
casts of the footprints in the soft earth outside the
window" [syn: footprint, step]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Footmark \Foot"mark`\, n.
A footprint; a track or vestige. --Coleridge.
[1913 Webster]