The Collaborative International Dictionary of English v.0.48:

Sabot \Sa`bot"\ (s[.a]`b[=o]"), n. [F.]
   1. A kind of wooden shoe worn by the peasantry in France,
      Belgium, Sweden, and some other European countries.
      [1913 Webster]

   2. (Mil.) A thick, circular disk of wood, to which the
      cartridge bag and projectile are attached, in fixed
      ammunition for cannon; also, a piece of soft metal
      attached to a projectile to take the groove of the
      rifling.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sabot
    n 1: a shoe carved from a single block of wood [syn: sabot,
         wooden shoe]
    2: footwear usually with wooden soles [syn: clog, geta,
       patten, sabot]