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

Type of: denseness, density

• fineness
• finer
• finery
• fines herbes
• finespun
• finesse
• Fingal's Cave
• finger
• finger alphabet
• finger bowl
• finger cymbals
• finger food
• finger grass
• finger hole
• Finger Lakes
• finger millet
• finger plate
• finger scan
• finger scanning
• finger wave
• finger's breadth
• finger-painting
• finger-roll
• fingerboard
• fingerbreadth