bol·ster 
(bōlstər)
(bōlstər)n.
A long narrow pillow or cushion.
tr.v. bol·stered, bol·ster·ing, bol·sters
1. To support or prop up with or as if with a long narrow pillow or cushion.
2. To buoy up or hearten: Visitors bolstered the patient's morale.
[Middle English, from Old English; see bhelgh- in the Appendix of Indo-European roots.]
bolster·er n.