'non-luminous' originates from Latin, specifically the word 'lūminōsus,' where 'lūmen' meant 'light' and the prefix 'non-' indicates negation.

'lūminōsus' transformed into the English word 'luminous,' and with the addition of the prefix 'non-,' it became 'non-luminous.'

Initially, 'lūminōsus' meant 'full of light,' but with the prefix 'non-,' it evolved into its current meaning of 'not emitting light.'