a girder is a form of:

Girder



noun
1.
(a large beam of timber or steel, used as a support in constructional engineering) រនូត, ឆ្នឹម, រត (ផ្ទះ)
ENGLISH MEANING
noun
1.
One who girds; a satirist.
2.
One who, or that which, girds.
3.
A main beam; a stright, horizontal beam to span an opening or carry weight, such as ends of floor beams, etc.; hence, a framed or built-up member discharging the same office, technically called a compound girder.