Lasso

Noun

 * 1) A long rope with a sliding loop on one end, generally used in ranching to catch cattle and horses.
 * 2)  An image-editing function allowing the user to capture an irregularly-shaped object by drawing an approximate outline.

Verb

 * 1) To catch with a lasso.

Thesaurus
annular muscle, annulus, areola, aureole, bag, bait, birdlime, bola, catch, chaplet, circle, circuit, circumference, circus, closed circle, cobweb, corona, coronet, crown, cycle, diadem, discus, disk, dragnet, enmesh, ensnare, entangle, entrap, eternal return, fairy ring, fishhook, fly, foul, garland, gill net, glory, ground bait, halo, harpoon, hook, jig, land, lariat, lime, logical circle, loop, looplet, lure, magic circle, mesh, meshes, nail, net, noose, orbit, plug, pound net, purse seine, radius, ring, rondelle, rope, round, roundel, sack, saucer, seine, snag, snare, sniggle, spear, sphincter, spinner, springe, squid, take, tangle, tangle up with, toils, trap, trawl, vicious circle, wheel, wobbler, wreath