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Lumenal (adjective)
Of or pertaining to the lumen
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Lumenal (adjective)
Relating to the cavity or channel within a tube or tubular organ.
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Luminal (adjective)
of or pertaining to the lumen
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Luminal (adjective)
of or pertaining to the nature of light
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Luminal (noun)
A sedative.
Wiktionary