A primitive inserted into a 3-D scene that is oriented so that one face is toward the viewer. A texture, usually an animated sprite, is applied to the billboard to give the appearance of a 3-D object in the scene.
Large outdoor signboard; SYN. hoarding.

ETYM From Old Fren. hourd, hourt, barrier, palisade, of German or Dutch origin; cf. Dutch horde hurdle, fence, German horde, hürde; akin to Eng. hurdle. Related to Hurdle.
The act of one who hoards.