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lumen noun (lumina or lumens) 1 physics (symbol lm) in the SI system: a unit of luminous flux, defined as the amount of light emitted by a point source of intensity one candela within a solid angle of one steradian. 2 biol in living organisms: the space enclosed by the walls of a vessel or tubular organ, eg within a blood vessel or intestine.
ETYMOLOGY: 19c: Latin, meaning 'light'.
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The Chambers Dictionary (13th edition)
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The Chambers Thesaurus
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Chambers Biographical Dictionary
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Consult Chambers 21st Century Dictionary, The Chambers Thesaurus (1996) or Chambers Biographical Dictionary (1997 edition with amendments). Enter your search and choose your title from the drop-down menu.
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