noun Download 🔗Share In 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. Examples : "The LED desk lamp produced 400 lumina, providing ample light for reading. " physics energy unit science Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share The cavity or channel within a tube or tubular organ. Examples : "The doctor checked the artery to ensure the lumina was clear and blood could flow easily. " anatomy physiology organ part medicine biology Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share The cavity bounded by a plant cell wall. Examples : "The plant cell's lumina were clearly visible under the microscope. " biology plant structure Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share The bore of a tube such as a hollow needle or catheter. Examples : "The doctor checked the catheter to ensure the lumina was clear before inserting it. " medicine anatomy Chat with AIVocabulary GamePractice Reading