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

Encyclopedia: Radio-opaque

• Sarah
• Sarah Bernhardt
• Sarah Kemble Siddons
• Sarah Siddons
• Sarah Vaughan
• Sarajevo
• saran
• Saran Wrap
• sarape
• Sarasota
• Sarasvati
• saratoga
• Saratoga chip
• Saratoga spittlebug
• Saratoga Springs
• Saratov
• Sarawak
• Sarawakian
• Sarazen
• sarcasm
• sarcastic
• sarcastically
• sarcenet
• Sarcobatus
• Sarcobatus vermiculatus