2. (Arch. & Engin.) 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. See Illusts. of Frame, and Doubleframed
floor, under Double.
Bowstring girder, Box girder, etc. See under Bowstring, Box, etc. --
Girder bridge. See under Bridge. -- Lattice girder, a girder consisting
of longitudinal bars united by diagonal crossing bars. -- Half-lattice
girder, a girder consisting of horizontal upper and lower bars
connected by a series of diagonal bars sloping alternately in opposite
directions so as to divide the space between the bars into a series of
triangles. Knight. -- Sandwich girder, a girder consisting of two
parallel wooden beams, between which is an iron plate, the whole
clamped together by iron bolts.
Gird"ing, n. That with which one is girded; a girdle.
Instead of a stomacher, a girding of sackcloth.
Is. iii. 24.