Definition of illuminant in English:


Syllabification: il·lu·mi·nant
Pronunciation: /iˈlo͞omənənt


A means of lighting or source of light: until 1880, oil was the only illuminant in use
More example sentences
  • While in defensive situations illuminants can be most valuable, in offensive situations, their use for surveillance and target acquisition can be counter-productive.
  • However, because the background radiance in the pelagic environment is a complex result of multiple scattering and absorption events, its spectrum changes independently of the illuminant.
  • Yes, there was a market for the refined illuminant.


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Giving off light.
More example sentences
  • The owner of the illuminant system was Mr WK Hardacre, of Hellifield House.
  • The XM930 contains a standard illuminant mix which provides approximately 1 million candlepower of light whereas the XM983 contains an infrared illuminant mix for use with standard night vision devices.
  • Given the illuminant spectrum and the spectral sensitivity functions for the camera, we can calculate the estimates of the weights at each pixel from six sensor outputs.


mid 17th century: from Latin illuminant- 'illuminating', from the verb illuminare (see illuminate).

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