| | Conditions & Treatments | Lupus Plural form of lumen in medical? The plural form of lumen in medical terminology is "lumina." Lumens are the hollow, open spaces within tubular structures in the body, such as the lumen of a blood vessel, intestine, or respiratory tract. Lupus - Related Articles Lupus in Older Adults: What You Should Know Signs & Symptoms of Kidney Disease & Lupus Bladder Pain in Lupus What does the corpus luteum serve? Does pelvic inflammatory disease affect white blood cell count? How to Deal With Lupus Fog What is the lunitidal interval for Durban?