1. Of dark grey
   - black-grey [Brit, Cdn], black-gray [US], blackish-gray [US]

See also: achromatic, neutral

• radiocarpal joint
• radiochemist
• radiochemistry
• radiochlorine
• radiocommunication
• radioelement
• radiogram
• radiograph
• radiographer
• radiographic
• radiography
• radioimmunoassay
• radioisotope
• Radiolaria
• radiolarian
• radiolocate
• radiolocation
• radiologic
• radiologic technologist
• radiological
• radiologist
• radiology
• radiolucent
• radiolysis
• radiometer