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

• February 2
• February 22
• February 29
• February daphne
• February Revolution
• fecal
• fecal impaction
• fecal matter
• fecal occult test
• fecalith
• feces
• Fechner
• Fechner's law
• feck
• feckless
• fecklessly
• fecklessness
• fecula
• feculence
• feculent
• fecund
• fecundate
• fecundation
• fecundity
• Fed