las·so 
(lăsō, lă-s)
(lăsō, lă-s)n. pl. las·sos or las·soes
A long rope with a running noose at one end, used especially to catch horses and cattle. Also called lariat.
tr.v. las·soed, las·so·ing, las·sos or las·soes
To catch, tie, or attach with or as if with a lasso.
[Spanish lazo, from Vulgar Latin *laceum, noose; see LACE.]
lasso·er n.
lasso