noun🔗ShareIn the International System of Units, the derived unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela. Symbol: lm."The new light bulb in the kitchen is much brighter; it emits 800 lumens. "physicsenergyunitscienceChat with AIVocabulary GamePractice Reading
noun🔗ShareThe cavity or channel within a tube or tubular organ."The doctor examined the lumens of the patient's intestines to look for any blockages. "anatomyorganphysiologymedicinebiologyChat with AIVocabulary GamePractice Reading
noun🔗ShareThe cavity bounded by a plant cell wall."Under a microscope, the lumens of the plant cells looked like tiny empty compartments. "plantbiologypartChat with AIVocabulary GamePractice Reading
noun🔗ShareThe bore of a tube such as a hollow needle or catheter."The doctor checked the lumens of the IV catheter to make sure they weren't blocked. "medicineanatomyparttechnicaldeviceChat with AIVocabulary GamePractice Reading
