Lasso n. : A rope or long thong of leather with, a running noose, used for catching horses, cattle, etc.

Lasso v. t. : To catch with a lasso.

Example:
How to select things perfectly with the Lasso tool in Photoshop?

Taxonomy
lasso, lariat, reata, cowboys, nylon rope, cattle, free encyclopedia, stiff, horn, prairie, loop knot, trick roping, practitioner, sacred bull, riata, the American cowboy, search, comic book character.

Defination from the web:
lasso (pronounced /ˌlæˈsuː/ or /ˈlæsoʊ/), alternatively (pronounced /ˌlæˈsoː/ or /ˈlæso/), also referred to as a lariat, riata, or reata (all ... The word is also a verb; to lasso is to successfully throw the loop of rope around something. ...