lumen

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  - lumber
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  - lumberer
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  - lumen
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  - luminance
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  - luminosity
  - luminous
  - lumme
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Concise Oxford English Dictionary © 2008 Oxford University Press:
lumen1 /ˈluːmɛn/ (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’.

Concise Oxford English Dictionary © 2008 Oxford University Press:
lumen2 /ˈluːmən/

▶noun (pl. lumina /-mɪnə/) Anatomy the central cavity of a hollow structure in an organism or cell.

– derivatives
luminal /ˈluːmɪn(ə)l/ adjective.

– origin C19: from L., lit. ‘opening’.

'lumen' also found in these Oxford entries:

illuminate - lambert - lm - lum - luminary - luminescence - luminous - lux - phillumenist - phot - superluminal

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