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lumina

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lu⋅men

  [loo-muhn]
Use lumina in a Sentence
–noun, plural -mens, -mi⋅na  [-muh-nuh] .
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. Abbreviation: lm
2. Anatomy. the canal, duct, or cavity of a tubular organ.
3. Botany. (of a cell) the cavity that the cell walls enclose.
Origin:
1870–75; < NL, special uses of L lūmen (s. lūmin-) light, window
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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lu·men   (lōō'mən)   
n.   pl. lu·mens or lu·mi·na (-mə-nə)

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

  2. Abbr. lm Physics The unit of luminous flux in the International System, equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions. See Table at measurement.

  3. Botany The cavity bounded by a plant cell wall.


[Latin lūmen, an opening, light; see leuk- in Indo-European roots.]
lu'men·al, lu'min·al adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: lu·men
Pronunciation: 'lü-m&n
Function: noun
Inflected Form: plural lu·mi·na /-m&-n&/ or lumens
1 : the cavity of a tubular organ lumen of a blood vessel>
2 : the bore of a tube (as of a hollow needle orcatheter)
3 : a unit of luminous flux equal to the light emitted in a steradian by a uniform point source of one candle intensity
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

lumen lu·men (l&oomacr;'mən)
n. pl. lumens or lu·mi·na (-mə-nə)

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

  2. The unit of luminous flux in the International System of Units, that is equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions.

lu'men·al or lu'min·al adj.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
lumen   (l'mən)  Pronunciation Key 
Plural lumens or lumina

  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.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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