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

• genus Phoenicurus
• genus Phoenix
• genus Pholas
• genus Pholidota
• genus Pholiota
• genus Pholis
• genus Pholistoma
• genus Phoradendron
• genus Photinia
• genus Photoblepharon
• genus Phoxinus
• genus Phragmipedium
• genus Phragmites
• genus Phrynosoma
• genus Phthirius
• genus Phthirus
• genus Phthorimaea
• genus Phyllitis
• genus Phyllium
• genus Phyllocladus
• pollute
• polluted
• polluter
• pollution
• Pollux