groundsheet

[ ground-sheet ]
/ ˈgraʊndˌʃit /

noun

a waterproof sheet of plastic, canvas, or other durable material spread on the ground, as under a sleeping bag or in a tent, for protection against moisture.
Also called ground cloth.

Origin of groundsheet

First recorded in 1905–10; ground1 + sheet1

British Dictionary definitions for groundsheet

groundsheet

ground cloth

/ (ˈɡraʊndˌʃiːt) /

noun

a waterproof rubber, plastic, or polythene sheet placed on the ground in a tent, etc, to keep out damp
a similar sheet put over a sports field to protect it against rain