Wordnet 3.0
NOUN (1)
1.
someone who applauds;
[syn: clapper, applauder]
The Collaborative International Dictionary of English v.0.48:
Applauder \Ap*plaud"er\, n.
One who applauds.
[1913 Webster]
WordNet (r) 3.0 (2006):
applauder
n 1: someone who applauds [syn: clapper, applauder]