From WordNet (r) 3.0 (2006) [wn]:
clothesline
n 1: a cord on which clothes are hung to dry
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Clothesline \Clothes"line`\ (kl[=o]z"l[imac]n`), n.
A rope or wire on which clothes are hung to dry.
[1913 Webster]