as in lamp
something that provides illumination
at the time, a spermaceti candle was the brightest indoor illuminant available
Synonyms & Similar Words
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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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Ryan Poehling and Frank Vatrano each lit the lamp, while Chris Kreider contributed two assists.—
Andrew Knoll,
Oc Register,
5 Mar. 2026
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Using a light therapy lamp, like those marketed for seasonal affective disorder, may help put some spring in your step.—
Jamie Ducharme,
Health,
5 Mar. 2026
Noun
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Once stationary, deactivate all lights except the hazard flashers, engage the emergency brake, and release the brake pedal to ensure your tail lights remain unlit, minimizing the chance of other drivers colliding with your stationary vehicle.—
NC Weather Bot,
Charlotte Observer,
9 Mar. 2026
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These include dimming the lights and minimizing the use of electronics before bed, keeping a consistent sleep schedule, maintaining a sleeping environment that's cool, dark, and quiet.—
Ari Daniel,
NPR,
8 Mar. 2026
Noun
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City records from November show police planned to install six more cameras and increase lighting.—
Cameron Knight,
Cincinnati Enquirer,
8 Mar. 2026
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Fans of the thunder-and-lighting combination — or the former Sonic and Knuckles moniker for Detroit Lions fans — will see the 5-foot-9, 195-pound Brown as a bolt out of the backfield who excels in catching the ball.—
Thomas Jones,
Austin American Statesman,
8 Mar. 2026
Noun
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Unsurprisingly, Fulham go up-market with a candle for £35, while for the Leeds United fan who has absolutely everything, here’s a wipe-clean table cover which, frankly, has to be seen to be believed.—
Tim Spiers,
New York Times,
4 Mar. 2026
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Brass had its moment, but our experts say to leave behind the sleek metal and instead mix textures, patterns, finishes, and materials by adding this under-$30 rattan lamp and these pretty candle holders into your decor.—
Stephanie Osmanski,
Better Homes & Gardens,
4 Mar. 2026
Cite this Entry
“Illuminant.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/illuminant. Accessed 10 Mar. 2026.
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