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.
plausor ōris, m plaudo, an applauder, enthusiastic hearer : In theatro, H. ...
An Elementary Latin Dictionary