noun, masculine/ɡʁa.vi.jɔ̃/plural: gravillons
gravillon is masculine in French.
fine grit, grains of stone of between six and twenty millimeters diameter
“Couvrir les allées de gravillons c'est économique mais cela demande de l'entretien.” — Covering the lanes with grit is cheap, but it demands maintenance.
Synonyms: mignonnette
Related: gravillonner, gravillonneur, gravillonneuse
Ca. 1571. From grave, gravier (“grit”).