1. Not transparent to X-rays or other forms of radiation
   - radiopaque

Encyclopedia: Radio-opaque

• 57
• 58
• 59
• 5th
• 6
• 6 June 1944
• 6-membered
• 60
• 60 minutes
• 60th
• 61
• 62
• 63
• 64
• 64th
• 65
• 65th
• 66
• 67
• 68
• 69
• 6th
• 7
• 7-membered
• 70