joist

English Thesaurus

1. beam used to support floors or roofs (noun.artifact)

hypernym	:	beam,
definition	:	long thick piece of wood or metal or concrete, etc., used in construction (noun.artifact)

hyponym	:	floor joist,
definition	:	joist that supports a floor (noun.artifact)

hyponym	:	trimmer, trimmer joist,
definition	:	joist that receives the end of a header in floor or roof framing in order to leave an opening for a staircase or chimney etc. (noun.artifact)