a piece of waterproofed cloth spread on the ground (as under a tent) to protect the occupants from moisture.

Thick polyester sheet or tarp that is laid under a tent to protect the floor.

A 10-mil thick polyester sheet that is laid under a tent to protect the floor.

A large piece of nylon or plastic for sitting on, or to protect the underside of a tent. Can also be strung up from a tree as a shelter