lumen

• Unité de flux lumineux dans le Système international d'unités, ou cavité ou passage à l'intérieur d'un organe tubulaire.

A unit of luminous flux in the International System of Units, or a cavity or passage within a tubular organ.

1. Unit of lightC1formalscientific

   A standard unit used to measure the total amount of visible light emitted by a source per unit of time.

   lumen (unité de flux lumineux)

   • A standard 60-watt bulb produces about 800 lumens.
   • The flashlight's brightness is rated at 1000 lumens.
   • Lumens measure the total light output, not the energy used.

2. Anatomical cavityC2formalmedical

   The inner open space or channel within a tubular structure in the body, such as a blood vessel or the intestine.

   Lumière (anatomie)

   • The surgeon examined the lumen of the artery for blockages.
   • Nutrients are absorbed through the lining of the intestinal lumen.
   • The lumen of the bronchial tube can narrow during an asthma attack.

   Synonymescavitychannelhollowinteriorspace