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umbra
/ˈum.brə/ noun
An area of darkness, caused by light being blocked by something.
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lumina
/luˈmi.nə/ noun
The brightness that comes from the sun, fire, etc., and that allows things to be seen.
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photography
/fəˈtɒɡrəfi/ noun
From the Greek roots phōtós, genitive of phōs (light) and graphē (drawing), together meaning "drawing with light".