as in lamp
something that provides illumination
at the time, a spermaceti candle was the brightest indoor illuminant available
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Recent Examples of illuminant
Related Stories For the Judge LED, users can choose seven light sources from a selection of different temperatures that fit industry standards, including a directional daylight output with the standard illuminant D65.
—
Sarah Jones, Sourcing Journal, 16 Jan. 2025
Distilling rock oil produced multiple interesting compounds, one of which looked like an ideal illuminant.
—Charles R. Morris, WSJ, 21 June 2018
Sarah Jones, Sourcing Journal, 16 Jan. 2025
Distilling rock oil produced multiple interesting compounds, one of which looked like an ideal illuminant.
—Charles R. Morris, WSJ, 21 June 2018
Recent Examples of Synonyms for illuminant
Noun
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Festival wares for sale include paintings, textiles, sculptures, pottery, jewelry, lamps, Halloween items, Christmas decor and so much more.—
Arkansas Online,
Arkansas Online,
12 Oct. 2025
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To open it up, flip the lamp on the end over to free the components.—
New Atlas,
New Atlas,
10 Oct. 2025
Noun
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Bader’s status Harrison Bader did some agility drills and light running in right field during Tuesday’s workout under the watchful eye of a half-dozen Phillies staff members.—
Matt Gelb,
New York Times,
8 Oct. 2025
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His Valentino show began with a spoken word reading — Pamela Anderson voicing a 1941 letter by Pier Paolo Pasolini about light enduring through darkness.—
Rhonda Richford,
Footwear News,
8 Oct. 2025
Noun
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Tesla also removed ambient lighting, certain exterior light bars, power-folding mirrors, and other upgrades introduced in previous refreshes.—
Aamir Khollam,
Interesting Engineering,
7 Oct. 2025
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During the end-of-year holiday season, there's Christmas tree lighting, breakfast with Santa, gingerbread house workshops, and Tommy the Real Elf experiences.—
Patricia Doherty,
Travel + Leisure,
7 Oct. 2025
Noun
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Stein’s bedroom adjoined the room where Dodge would visit her lover at night; kept awake by the murmurings and moans, Stein lit a candle and composed a portrait of her host.—
Via Scribner,
Literary Hub,
7 Oct. 2025
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There’s no limit to the number of candle holders a votive-loving household can have.—
Erika Owen,
Architectural Digest,
7 Oct. 2025
Cite this Entry
“Illuminant.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/illuminant. Accessed 14 Oct. 2025.
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