Webster's English Dictionary

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lasso

1. las.so \'las-(.)o-, la-'su:\ n or lassos or lassoes [Sp lazo, fr. L 
   laqueus snare - more at DELIGHT] pl  : a rope or long throng of leather 
   with a running noose that is used esp.  for catching horses and cattle : 
   LARIAT
2. lasso vt : to catch with or as if with a lasso : ROPE  - las.so.er n