lumen

[ loo-muhn ]

noun

, plural lu·mens, lu·mi·na [loo, -m, uh, -n, uh].

1. Optics. the unit of luminous flux, equal to the luminous flux emitted in a unit solid angle by a point source of one candle intensity. : lm
2. Anatomy. the canal, duct, or cavity of a tubular organ.
3. Botany. (of a cell) the cavity that the cell walls enclose.

lumen

/ ˈluːmɪn /

noun

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 lm
2. anatomy a passage, duct, or cavity in a tubular organ
3. a cavity within a plant cell enclosed by the cell walls

lumen

/ lo̅o̅′mən /

, Plural lumens

1. The central space within a tube-shaped body part or organ, such as a blood vessel or the intestine.
2. The SI derived unit used to measure the amount of light passing through a given area per second. One lumen is equal to the luminous flux passing per unit solid angle from a light source with a strength of one candela.

Derived Forms

• ˈlumenal, adjective

Word History and Origins

Origin of lumen¹

1870–75; < New Latin, special uses of Latin lūmen (stem lūmin- ) light, window

Word History and Origins

Origin of lumen¹

C19: New Latin, from Latin: light, aperture

Example Sentences

But that kind of chatter is as quiet as Lumen Field was when Robinson reached up with one hand and reeled in that perfectly placed touchdown pass.

From Los Angeles Times

That’s what the Rams did on Sunday, winning their third game in a row with a 26-20 overtime victory over the Seahawks before 68,632 at Lumen Field.

From Los Angeles Times

Everything you need to know about the Rams facing the Seattle Seahawks at Lumen Field on Sunday, including start time, TV channel and betting odds.

From Los Angeles Times

How aggressive the Rams are at the trade deadline could be determined by how they fare Sunday when they play the Seattle Seahawks at Lumen Field in Seattle.

From Los Angeles Times

On Sept. 14, the Huskies and Cougs will meet as nonconference opponents at Lumen Field.

From Seattle Times