lumen
Use Lumen in a sentence
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mən noun, plural lu·mens, lu·mi·na [-muh-nuh] .
[-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; < Neo-Latin, special uses of Latin lūmen (stem lūmin-) light, window
1870–75; < Neo-Latin, special uses of Latin lūmen (stem lūmin-) light, window
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To lumen
Collins
World English Dictionary
lumen (ˈluːmɪn) ![[Click for IPA pronunciation guide]](http://static.sfdict.com/dictstatic/g/d/dictionary_questionbutton_default.gif) | |
| —n , pl -mens, -mina | |
| 1. | lm 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 |
| 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 | |
| —adj | |
| 'luminal | |
| —adj | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Lumen
is always a great word to know.
So is quincunx. Does it mean:
| a chattering or flighty, light-headed person. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
Etymonline
Word Origin & History
lumen
unit of luminosity, 1898, coined 1894 in Fr. (A. Blondel) from L. lumen "light," related to lucere "to shine" (see light (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary
lumen lu·men (l&oomacr;'mən)
n. pl. lumens or lu·mi·na (-mə-nə)
The inner open space or cavity of a tubular organ, as of a blood vessel.
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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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
lumen (l 'mən) Pronunciation Key
Plural lumens or lumina
|
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
With more protons inside the lumen than the stroma, the pH is much lower inside the lumen.
The nuclei alternate on opposite surfaces of the tubule so that the lumen remains fairly constant.
Lumen maintenance strategies have only recently become economically viable for general use.
The movements of the jaw influence to some extent the lumen of this latter portion.
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