achromatic color, achromatic colour - a color lacking hue; white or gray or black

ash gray, ash grey, silver gray, silver grey, silver - a light shade of gray

charcoal gray, charcoal grey, oxford gray, oxford grey, charcoal - a very dark gray color

dapple-gray, dapple-grey, dappled-gray, dappled-grey - gray with a mottled pattern of darker gray markings

iron-gray, iron-grey - the color of freshly broken cast iron

tattletale gray, tattletale grey - a grayish white

Davy's gray, iron blue, steel gray - slightly purplish or bluish dark gray