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

Encyclopedia: Radio-opaque

• matting
• mattock
• Mattole
• mattress
• mattress cover
• mattress pad
• maturate
• maturation
• maturational
• mature
• mature-onset diabetes
• matured
• maturely
• maturement
• matureness
• maturity
• maturity date
• maturity-onset diabetes
• maturity-onset diabetes mellitus
• matutinal
• maty
• matzah
• matzah ball
• matzah meal
• matzo