lumen

lumen

 [lu´men] (L.)

1. the cavity or channel within a tube or tubular organ, as a blood vessel or the intestine.

2. the SI unit of rate of flow of radiant energy, specifically that of the visible spectrum. adj., adj lu´minal.

lu·men

, pl.

lu·mi·na

,

lu·mens

(lū'men, -min-ă, -menz),

1. The space in the interior of a hollow tubular structure (for example, artery or intestine).

2. The unit of luminous flux; the luminous flux emitted in a unit solid angle of 1 steradian by a uniform point source of light having a luminous intensity of 1 candela.

3. The volume enclosed within the membranes of a mitochondrion or of the endoplasmic reticulum.

4. The bore of a catheter or hollow needle.

[L. light, window]

lumen

/lu·men/ (loo´men) pl. lu´mina   [L.]

1. the cavity or channel within a tube or tubular organ.

2. the SI unit of luminous flux; it is the light emitted in a unit solid angle by a uniform point source with luminous intensity of one candela.lu´minal

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residual lumen  the remains of Rathke's pouch, between the distal and intermediate parts of the pituitary gland.

lumen

(lo͞o′mən)

n. pl. lu·mens or lu·mina (-mə-nə)

1. Anatomy The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine.

2. Biology The interior of a membrane-bound compartment or organelle in a cell.

3. Abbr. lmPhysics The SI unit of luminous flux, equal to the amount of light per unit time passing through a solid angle of one steradian from a light source of one candela intensity radiating equally in all directions. See Table at measurement.

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lu′men·al, lu′min·al adj.

lumen

[lo̅o̅′mən] pl. lumina, lumens

Etymology: L, light

1 a tubular space or the channel within any organ or structure of the body.

2 a unit of luminous flux that equals the flux emitted in a unit solid angle by a point source of one candle intensity. lumenal, luminal, adj.

lu·men

(lm), pl. lumina (lū'mĕn, -mi-nă)

1. The space in the interior of a tubular structure, such as an artery or intestine.

2. The unit of luminous flux; the luminous flux emitted in a unit solid angle of 1 steradian by a uniform point source of light having a luminous intensity of 1 candela.

[L. light, window]

lumen

The inside of any tube, such as a blood vessel, an air passage (bronchus) or the intestine.

lumen

any cavity enclosed within a cell, or structure, such as the lumen of the gut.

Lumen

The inner cavity or canal of a tube-shaped organ, such as the bowel.

Mentioned in: Amebiasis

lumen

1. SI unit of luminous flux. It is equal to the flux emitted within a unit solid angle of one steradian by a point source with a luminous intensity of one candela. Symbol: lm. 2. The space in the interior of a tubular organ, such as an artery. See luminous flux; quantity of light; lux; SI unit.

Table L4 Approximate luminance (in cd/m2) of some objects
sun	109
car headlight	107
incandescent lamp (tungsten)	106-107
fluorescent lamp	104-105
clear sky at noon	104
cloudy sky at noon	103
shady street by day	103-104
full moon	103
book print under artificial light	>102
photopic vision	>10
street illumination	1-10−1
mesopic vision	10-10−3
cloudless night sky with full moon	10−2
scotopic vision	<10−3
moonless and cloudless night sky	10−3-10−6

lu·men

, pl. lumina (lūmĕn, -mi-nă)

1. Space in interior of a hollow tubular structure (e.g., artery or intestine).

2. The bore of a catheter or hollow needle.

[L. light, window]

lumen

pl. lumina [L.]

1. the cavity or channel within a tube or tubular organ, as a blood vessel or the intestine.

2. the SI unit of light flux.