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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The two residents who shared the bare room had no TV, no lamps, and the blinds didn’t work.—
Carol Marbin Miller,
Miami Herald,
2 Apr. 2026
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No matter the size, the decor is all Old World luxury—brocade upholstery, crystal lamp bases, and marble counters.—
Condé Nast,
Condé Nast Traveler,
2 Apr. 2026
Noun
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Other tips include riding defensively around cars, using front and rear lights, wearing reflective vests in the dark, and avoiding biking under the influence of drugs or alcohol.—
Sarah Raza,
Chicago Tribune,
30 Mar. 2026
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Before Jody, nobody had ever pushed me to consider the frame, the light, or even the words on the page.—
Lena Dunham,
New Yorker,
30 Mar. 2026
Noun
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The grandiose space’s massive stage and high-caliber lighting rigs promise extravagant parties and ceremonies that will light up the city’s social calendar.—
Condé Nast,
Condé Nast Traveler,
30 Mar. 2026
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Scenic designer Matthew Herman created a rectangular center stage with LED panel lighting by Sammy Webster that mimics the flourescent office lights of the past but explodes with color in a surprise dancing-on-the-tables scene.—
Pam Kragen,
San Diego Union-Tribune,
29 Mar. 2026
Noun
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Like the restaurant, Toja draws on local traditions with a spa menu that includes invigorating pijat massages and exfoliating scrubs with rice, ginger, and candle nut.—
Condé Nast,
Condé Nast Traveler,
31 Mar. 2026
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Use a low amber light or candle if safety is a concern.—
Allison Palmer,
Sacbee.com,
31 Mar. 2026
Cite this Entry
“Illuminant.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/illuminant. Accessed 5 Apr. 2026.
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