Is polyurethane a plastic?

Plastic is a very generalized term for polymers that can mean either a thermosetting or a thermoplastic Plastic. There is Polyethylene Terephthalate (PETE), Low Density Polyethylene (LDPE), High Density Polyethylene (HDPE), Polypropylene (PPE), Vinyl (V), Styrofoam (Polystyrene), on the thermoplastic side and bakelite on the thermosetting side. Polyurethane, however, is an elastomer.