Lewis Short
plausor | plÅsor (noun M) : (, Sid. Ep. 9, 3; id. Carm. 9, 300), , id.
* 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.
Charlton T. Lewis, Charles Short, A Latin Dictionary