wolf spider

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various spiders of the family Lycosidae that stalk prey on the ground and do not spin webs.

from The Century Dictionary.

• noun Any spider of the family Lycosidæ, the species of which do not lie in wait, but prowl about after their prey and spring upon it; a tarantula. See Lycosidæ, and cuts under tarantula, 1.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of several spiders, of the family Lycosidae, that are known for stalking their prey on the ground and not building webs.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun ground spider that hunts its prey instead of using a web