1. Having a dark colour
   - dark-colored [US], dark-coloured [Brit, Cdn], dusky-colored [US]

See also: colored [US], colorful [US], coloured [Brit, Cdn], colourful [Brit, Cdn]

• oligodontia
• oligomenorrhea
• oligonucleotide
• Oligoplites
• oligopoly
• Oligoporus
• Oligoporus leucospongia
• oligopsony
• oligosaccharide
• oligospermia
• oligotrophic
• oliguria
• Olimbos
• olio
• olivaceous
• olive
• olive branch
• olive drab
• olive family
• olive oil
• olive ridley
• olive tree
• olive-brown
• olive-colored
• olive-coloured