transcription, транскрипция: [ ˈlü-mən ]
noun
( plural lumens also lu·mi·na -mə-nə)
Etymology: New Latin lumin-, lumen, from Latin, light, air shaft, opening
Date: 1873
1. : the cavity of a tubular organ or part
the lumen of a blood vessel
2. : the bore of a tube (as of a hollow needle or catheter)
3. : a unit of luminous flux equal to the light emitted in a unit solid angle by a uniform point source of one candle intensity
• lu·mi·nal also lu·men·al -mə-n ə l adjective