The Collaborative International Dictionary of English v.0.48:

Necktie \Neck"tie`\, n.
   A scarf, band, or kerchief of silk, etc., passing around the
   neck or collar and tied in front; a bow of silk, etc.,
   fastened in front of the neck.
   [1913 Webster]

WordNet (r) 3.0 (2006):

necktie
    n 1: neckwear consisting of a long narrow piece of material worn
         (mostly by men) under a collar and tied in knot at the
         front; "he stood in front of the mirror tightening his
         necktie"; "he wore a vest and tie" [syn: necktie, tie]