Definition of gravels:
(n) :
(uncountable) Small fragments of rock, used for laying on the beds of roads and railways, and as ballast.
(n) :
A type or grade of small rocks, differentiated by mineral type, size range, or other characteristics.
(n) :
(uncountable, geology) A particle from 2 to 64 mm in diameter, following the Wentworth scale.
(n) :
(uncountable, cycling) 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.
(v) :
(transitive) To apply a layer of gravel to the surface of a road, etc.
(v) :
(transitive) To puzzle or annoy.