"étendue" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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          "ref": "2003, Wolfgang Demtröder, “Spectroscopic Instrumentation”, in Laser Spectroscopy: Basic Concepts and Instrumentation (Advanced Texts in Physics), 3rd edition, Berlin: Springer-Verlag, →DOI, →ISBN, →ISSN, page 149:",
          "text": "The light power transmitted to the detector is proportional to the product of the solid angle #92;mathit#123;#92;Omega#125; and area A in the central plane, which is imaged by the lens onto the aperture (often called the étendue U).",
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  "word": "étendue"
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