1. (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation
   - optical density, photographic density, absorbance

Type of: denseness, density

• Mastotermitidae
• masturbate
• masturbation
• masturbator
• mat
• mat up
• Mata Hari
• Matabele
• matador
• matai
• Matakam
• Matamoros
• match
• match game
• match plane
• match play
• match point
• matchable
• matchboard
• matchbook
• matchbox
• matchbush
• matched
• matched game
• matcher