Luminal

lu·men  (lmn)

n. pl. lu·mens or lu·mi·na (-m-n)

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.

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[Latin lmen, an opening, light; see leuk- in Indo-European roots.]

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lumen·al, lumin·al adj.

Thesaurus

Noun

1.

Luminal - a long-acting barbiturate used as a sedative phenobarbital, phenobarbitone, sodium thiopental, purple heart barbiturate - organic compound having powerful soporific effect; overdose can be fatal