Bolster

bōl′stėr, n. a long round pillow or cushion: a pad: anything resembling it in form or use, esp. any piece of mechanism affording a support against pre ure.— v.t. to support with a bolster: to hold up.— p.adj. Bol′stered , supported: swelled out.— n. Bol′stering , a propping up or supporting. [A.S. bolster ; from root of Bowl .]