n pl , -mens, -mina
1 the derived SI unit of luminous flux; the flux emitted in a solid angle of 1 steradian by a point source having a uniform intensity of 1 candela., (Symbol)
2 (Anatomy) a passage, duct, or cavity in a tubular organ
3 a cavity within a plant cell enclosed by the cell walls
(C19: New Latin, from Latin: light, aperture)
lumenal, luminal adj
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