~ 1 [ 'lu:mɛn ]
(abbrev.: lm )
■ noun Physics the SI unit of luminous flux, equal to the amount of light emitted per second in a unit solid angle of one steradian from a uniform source of one candela.
Origin
C19: from L., lit. 'light'.
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~ 2 [ 'lu:mən ]
■ noun ( plural lumina -mɪnə ) Anatomy the central cavity of a hollow structure in an organism or cell.
Derivatives
luminal 'lu:mɪn(ə)l adjective
Origin
C19: from L., lit. 'opening'.