lumen

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lu·men1 / ˈloōmən/ (abbr.: lm) • n. Physics the SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela. lu·men2 • n. (pl. -mi·na / -mənə/ ) Anat. the central cavity of a tubular or other hollow structure in an organism or cell. DERIVATIVES: lu·mi·nal / -mənl/ adj.

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lumen
1. The space enclosed by a vessel, duct, or other tubular or saclike organ. The central cavity of blood vessels and of the digestive tract are examples.

2. Symbol lm. The SI unit of luminous flux equal to the flux emitted by a uniform point source of 1 candela in a solid angle of 1 steradian.

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lumen (symbol lm) SI unit measuring the amount of light in an area for one second. The light emits in a unit solid angle (one steradian) from a source of unit intensity (one candela).

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lumen A space enclosed by cell walls. Compare LACUNA.

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lumen (loo-min) n.
1. the space within a tubular or saclike part.

2. the SI unit of luminous flux. Symbol: lm.

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lumen: see photometry.

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lumen A cavity inside a cell or bodily structure.