giggler

from WordNet (r) 3.0 (2006)
giggler
    n 1: a person who laughs nervously [syn: {titterer}, {giggler}]
    
from The Collaborative International Dictionary of English v.0.48
Giggler \Gig"gler\, n.
   One who giggles or titters.
   [1913 Webster]
    

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