WordReference Random House Unabridged Dictionary of American English © 2020
Lu•mi•nal  (lo̅o̅mə nl),USA pronunciation [Pharm., Trademark.]
  1. Drugs, Trademarksa brand of phenobarbital.

WordReference Random House Unabridged Dictionary of American English © 2020
lu•men  (lo̅o̅mən),USA pronunciation n., pl.  -mens, -mi•na 
    (lo̅o̅mən),USA pronunciation 
  1. Opticsthe unit of luminous flux, equal to the luminous flux emitted in a unit solid angle by a point source of one candle intensity. Abbr.: lm
  2. Anatomythe canal, duct, or cavity of a tubular organ.
  3. Botany(of a cell) the cavity that the cell walls enclose.
  • Neo-Latin, special uses of Latin lūmen (stem lūmin-) light, window
  • 1870–75

Collins Concise English Dictionary © HarperCollins Publishers::
lumen /ˈluːmɪn/ n ( pl -mens, -mina / -mɪnə/)
  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
    Symbol: lm
  2. a passage, duct, or cavity in a tubular organ
  3. a cavity within a plant cell enclosed by the cell walls
Etymology: 19th Century: New Latin, from Latin: light, aperture

ˈlumenal, ˈluminal adj
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