stringboard
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Related to stringboard: springboard
string·board
(strĭng′bôrd′)n.
A board that runs along the side of a staircase to support or cover the ends of the steps.
stringboard
(ˈstrɪŋˌbɔːd)n
(Architecture) a skirting that covers the ends of the steps in a staircase. Also called: stringer