a framework of beams laid crosswise, used as a support or foundation, as for a building on soft ground
Origin of grillageFrench wirework, grating, frame ; from grille: see grille
A network or frame of timber or steel serving as a foundation, usually on ground that is wet or soft.
Origin of grillageFrench, from Old French, trellis, from greille, gridiron; see grill.
Originated 1770–80 from French grillage.