self-lu·​mi·​nous ˌself-ˈlü-mə-nəs How to pronounce self-luminous (audio)
: generating and emitting its own visible light
… Venus … is not self-luminous but lit by the sun …Derek J. deSolla Price
Radium paint is actually self-luminous—when freshly applied, it requires no external energy source …Jack Forster

Word History

First Known Use

1751, in the meaning defined above

Time Traveler
The first known use of self-luminous was in 1751

Dictionary Entries Near self-luminous

Cite this Entry

“Self-luminous.” Dictionary, Merriam-Webster, Accessed 22 Feb. 2024.

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