lumen

noun
UK: /ˈluːmen/
US: /ˈluːmən/

  1. The SI unit of luminous flux, a measure of the total amount of visible light emitted by a source.

    1. This lamp has a 800 lumen output. [ ] [ ]
    2. The new lighting system significantly increased the lumen output in the laboratory, improving visibility. [ ] [ ]

  2. The cavity or channel within a tubular structure in a living organism, such as a blood vessel.

    1. Blood flows through the vessel lumen. [ ] [ ]
    2. The doctor examined the lumen of the intestine using an endoscope to check for abnormalities. [ ] [ ]

Synonyms

candela channel brightness cavity light bore
lumen verb

  1. To measure the luminous flux, determining the light emitted.

    1. We lumen the light daily. [ ] [ ]
    2. The scientists will lumen the sample to test its brightness. [ ] [ ]

Frequently Asked Questions

The word "lumen" in English means: The SI unit of luminous flux, a measure of the total amount of visible light emitted by a source., The cavity or channel within a tubular structure in a living organism, such as a blood vessel..

The phonetic transcription of "lumen" is /ˈluːmen/ in British English and /ˈluːmən/ in American English. Click the 🔊 button to hear both pronunciations.

Synonyms for "lumen": candela, channel, brightness, cavity, light, bore.

Example usage of "lumen": "This lamp has a 800 lumen output.". More examples on the page.