What is the meaning of Gravel?

Small fragments of rock, used for laying on the beds of roads and railways, and as ballast.

A type or grade of small rocks, differentiated by mineral type, size range, or other characteristics.

A particle from 2 to 64 mm in diameter, following the Wentworth scale.

Kidney stones; a deposit of small calculous concretions in the kidneys and the urinary or gall bladder; also, the disease of which they are a symptom.

A lameness in the foot of a horse, usually caused by an abscess.

Inability to see at night; night blindness.

Gravel cycling, a discipline in cycling different from road cycling, mountain biking or cyclocross, for a large part on gravel roads, typically with a dedicated gravel bike.

The stimulant drug alpha-pyrrolidinopentiophenone.

To apply a layer of gravel to the surface of a road, etc.

To puzzle or annoy.

To run (as a ship) upon the gravel or beach; to run aground; to cause to stick fast in gravel or sand.

To check or stop; to confound; to perplex.

To hurt or lame (a horse) by gravel lodged between the shoe and foot.

To prostrate; to beat to the ground.

claycourt (surface for playing tennis)

durable bicycle capable of riding over gravel or other hard terrain; mountain bike

bicycling competition on gravel or other hard terrain

mountain bike

sand, gravel

pebbles

the disease so named

Source: wiktionary.org