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

• freshwater
• freshwater bass
• freshwater bream
• freshwater clam
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• freshwater eel
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• freshwater mussel
• Fresnel
• Fresnel lens
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• fress
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• Freud
• Freudian
• Freudian psychology
• Freudian slip
• Frey