a timber or plate connecting the corner posts of an exterior wooden frame, as a braced frame, at a floor above the ground floor.
b.
a heavy beam, as for supporting the ends of rafters.
2.
Printing. (in certain hand presses) one of a pair of leather straps having one end fastened to the bed and the other to the rounce, for drawing the bed under the platen.
O.E. gyrdan "put a belt or girdle around," from P.Gmc. *gurthjanan (cf. O.N. gyrða, O.Fris. gerda, O.H.G. gurtan, Ger. Gürten). Related to O.E. geard "hedge, enclosure" (see yard (1)). Girder "main beam that carries flooring" is first attested 1611.