An Etymological Dictionary of Astronomy and Astrophysics
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Characterized by light of one color or by radiation of a single wavelength or narrow range of wavelengths.

→ mono-; → chromatic.

The sum of → absorption coefficient (κ_ν) and → scattering coefficient (σ_ν) at a given frequency: k_ν = κ_ν + σ_ν. See also the → Rosseland mean opacity.

→ monochromatic; → opacity.