The Collaborative International Dictionary of English v.0.48:
Lingerer \Lin"ger*er\ (l[i^][ng]"g[~e]r*[~e]r), n. One who lingers. --Guardian. [1913 Webster]WordNet (r) 3.0 (2006):
lingerer n 1: someone who lingers aimlessly in or about a place [syn: loiterer, lingerer]