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

• Klyuchevskaya
• km
• km/h
• knack
• knacker
• knackered
• knackers
• knackwurst
• knag
• knap
• knapsack
• knapweed
• knave
• knavery
• knavish
• knavishly
• knawe
• knawel
• knead
• kneadable
• kneader
• knee
• knee bend
• knee brace
• knee breeches