Source : Webster's Revised Unabridged Dictionary (1913)

Revetment \Re*vet"ment\, n. [F. rev[^e]tement the lining of a
   ditch, fr. rev[^e]tir to clothe, L. revestire. See {Revest},
   v. t.] (Fort. & Engin.)
   A facing of wood, stone, or any other material, to sustain an
   embankment when it receives a slope steeper than the natural
   slope; also, a retaining wall. [Written also
   {rev[^e]tement}.]

Source : WordNet®

revetment
     n 1: a barrier against explosives
     2: a facing (usually masonry) that supports an embankment [syn:
         {revetement}, {stone facing}]