type of:

beam

long thick piece of wood or metal or concrete, etc., used in construction

types:

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crossbar

long thin horizontal crosspiece between two vertical posts

rundle, rung, spoke

one of the crosspieces that form the steps of a ladder

round, rung, stave

a crosspiece between the legs of a chair

cross thwart, thwart

a crosspiece spreading the gunnels of a boat; used as a seat in a rowboat

transom, traverse

a horizontal crosspiece across a window or separating a door from a window over it

type of:

brace, bracing

a structural member used to stiffen a framework