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

See also: achromatic, neutral

• ostentatious
• ostentatiously
• ostentatiousness
• osteo-
• osteoarthritis
• osteoblast
• osteoblastoma
• osteochondroma
• osteoclasis
• osteoclast
• osteocyte
• osteodystrophy
• osteogenesis imperfecta
• osteogenic sarcoma
• Osteoglossidae
• Osteoglossiformes
• osteoid
• osteologer
• osteological
• osteologist
• osteology
• osteolysis
• osteoma
• osteomalacia
• osteomyelitis