plausor (plōsor, Sid. Ep. 9, 3; id. Carm. 9, 300), ōris, m. [plaudo], one who claps applause, an applauder (poet. and in post-Aug. prose): in vacuo laetus sessor plausorque theatro, Hor. Ep. 2, 2, 130; Petr. 5; Suet. Ner. 25.