thong

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A narrow strip, as of leather, used for binding or lashing.
2. n. A whip of plaited leather or cord.
3. n. A sandal held on the foot by a strip that fits between the first and second toes and is connected to a strap usually passing over the top or around the sides of the foot.
4. n. A garment for the lower body that exposes the buttocks, consisting of a narrow strip of fabric that passes between the thighs supported by a waistband.

Century Dictionary and Cyclopedia

1. n. A long narrow strip of leather; a narrow strap, used as a fastening, a halter, reins, the lash of a whip, the latchet of a shoe, and in many other ways. See cut under snow-shoe.
2. To provide, fit, or fasten with a thong.
3. To strike with a thong, or with a similar implement, as the lash of a whip.
4. To rope; stretch out into viscous threads or filaments.

Wiktionary

1. n. A strip of leather.
2. n. usually plural, Australia, US An item of footwear, usually of rubber, secured by two straps which join to pass between the big toe and its neighbour.
3. n. UK, US, New Zealand An undergarment or swimwear consisting of very narrow strips designed to cover just the genitals and nothing more.

GNU Webster's 1913

1. n. A strap of leather; especially, one used for fastening anything.

WordNet 3.0

1. n. underpants resembling a G-string; worn by women especially under very tight pants
2. n. a backless sandal held to the foot by a thong between the big toe and the second toe
3. n. a thin strip of leather; often used to lash things together
4. n. minimal clothing worn by stripteasers; a narrow strip of fabric that covers the pubic area, passes between the thighs, and is supported by a waistband
5. n. leather strip that forms the flexible part of a whip