Definition of optical density in US English:

optical density


  • The degree to which a refractive medium retards transmitted rays of light.

    • ‘The antioxidant potential of serum was calculated by the decrease in the optical density during the first minute.’
    • ‘Cultures were grown to an optical density of 1.0 in rich medium containing 2% dextrose.’
    • ‘The second method comprised measuring optical densities of bacterial cultures.’
    • ‘The physical density is changed, but is the optical density changed as well?’
    • ‘For each sample, the optical densities were plotted as a function of volume loaded.’