Webster's English Dictionary

Enter the word to look up:

pilaster

pi.las.ter \'pi--.las-t*r also p*-'las-, pi--'\ n [MF pilastre, fr. It 
   pilastro] : an upright architectural member that is rectangular in plan and 
   is struc turally a pier but architecturally treated as a column and that 
   usu. projects a third of its width or less from the wall