girder

noun

main horizontal support of a structure which supports smaller beams, often with an I-beam cross section composed of two load-bearing flanges separated by a stabilizing web, but may also have a box shape, Z shape and other forms

Wiktionary

Pronunciation: /ˈɡɜːdə(ɹ)/ / /ˈɡɝdɚ/

noun

Etymology: Etymology tree English gird Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English girder From gird + -er.

A beam of steel, wood, or reinforced concrete, used as a main horizontal support in a building or structure.
One who girds; a satirist.