Source : Webster's Revised Unabridged Dictionary (1913)

Hoof \Hoof\, n.

   {On the hoof}, of cattle, standing (on the hoof); not
      slaughtered. Hook \Hook\, n. (Geog.)
   A spit or narrow cape of sand or gravel turned landward at
   the outer end; as, Sandy Hook.

Hoof \Hoof\, n.; pl. {Hoofs}, very rarely {Hooves}. [OE. hof,
   AS. h[=o]f; akin to D. hoef, G1huf, OHG. huof, Icel. h[=o]fr,
   Sw. hof, Dan. hov; cf. Russ. kopuito, Skr. [,c]apha.
   [root]225.]
   1. The horny substance or case that covers or terminates the
      feet of certain animals, as horses, oxen, etc.

            On burnished hooves his war horse trode. --Tennyson.

   2. A hoofed animal; a beast.

            Our cattle also shall go with us; there shall not a
            hoof be left behind.                  --Ex. x. 26.

   3. (Geom.) See {Ungula}.

Hoof \Hoof\, v. i.
   1. To walk as cattle. [R.] --William Scott.

   2. To be on a tramp; to foot. [Slang, U.S.]

   {To hoof it}, to foot it.

Source : WordNet®

hoof
     n 1: the foot of an ungulate mammal
     2: the horny covering of the end of the foot in hoofed mammals
     [also: {hooves} (pl)]

hoof
     v 1: walk; "let's hoof it to the disco" [syn: {foot}, {leg it}, {hoof
          it}]
     2: dance in a professional capacity
     [also: {hooves} (pl)]