Webster's English Dictionary

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bolster

1. bol.ster \'bo-l-st*r\ n [ME, fr. OE; akin to OE belg bag - more at 
   BELLY] 1: a long pillow or cushion extending the full width of a bed  2: a 
   structural part designed to eliminate friction or provide support or b 
   earing; esp : the horizontal connection between the volutes of an Ionic 
   capital
2. bolster \-st(*-)rin\ \-st*r-*r\ vt or bol.ster.ing : to support with or 
   as if with a bolster; also : REINFORCE  - bol.ster.er n