The Collaborative International Dictionary of English v.0.48:

Noose \Noose\, n. [Prob. fr. OF. nous, nom. sing. or acc. pl. of
   nou knot, F. n[oe]ud, L. nodus. Cf. Node.]
   A running knot, or loop, which binds the closer the more it
   is drawn.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Noose \Noose\ (n[=oo]z), v. t. [imp. & p. p. Noosed
   (n[=oo]zd); p. pr. & vb. n. Noosing.]
   To tie in a noose; to catch in a noose; to entrap; to
   insnare.
   [1913 Webster]

WordNet (r) 3.0 (2006):

noose
    n 1: a trap for birds or small mammals; often has a slip noose
         [syn: snare, gin, noose]
    2: a loop formed in a cord or rope by means of a slipknot; it
       binds tighter as the cord or rope is pulled [syn: noose,
       running noose, slip noose]
    v 1: make a noose in or of
    2: secure with a noose