1. Of the colour of slate or granite
   - slate-grey [Brit, Cdn], slate-gray [US], slaty-grey [Brit, Cdn], slaty-gray [US], slaty, slatey, stone-gray [US]

See also: achromatic, neutral

• coal miner's lung
• coal oil
• coal scuttle
• coal seam
• coal shovel
• coal tar
• coal tongs
• coal-black
• coal-burning
• coal-fired
• coal-tar creosote
• coalbin
• coaler
• coalesce
• coalesced
• coalescence
• coalescency
• coalescent
• coalescing
• coalface
• coalfield
• coalfish
• coalhole
• cask
• casket