Source : Webster's Revised Unabridged Dictionary (1913)

Buttress \But"tress\, v. t. [imp. & p. p. {Buttressed} (?); p.
   pr. & vb. n. {Buttressing}.]
   To support with a buttress; to prop; to brace firmly.

         To set it upright again, and to prop and buttress it up
         for duration.                            --Burke.

Source : WordNet®

buttressing
     n : a support usually of stone or brick; supports the wall of a
         building [syn: {buttress}]