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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This end table, which is going for under $30, has three shelves that can hold a lamp, books, storage baskets, and other living room accessories.—
Kaitlin Gates,
PEOPLE,
8 Nov. 2025
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The British company Lumie, which specializes in modern-looking light-therapy lamps, recently launched the Lumie Dash ($225), a compact, ten-thousand-lux model that comes in friendly colors like terra-cotta and pistachio.—
Hilton Als,
New Yorker,
7 Nov. 2025
Noun
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In fact, this team found that even after the light from Type Ia supernovas was standardized, Type Ia supernovas from populations of younger stars were fainter than those belonging to older stellar populations.—
Robert Lea,
Space.com,
6 Nov. 2025
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Never use your high-beam lights.—
CA Weather Bot,
Sacbee.com,
6 Nov. 2025
Noun
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Teams that set meeting windows, encourage short breaks, and support ergonomic basics may notice steadier output and fewer end-of-week slumps, especially when people adjust lighting, seat height, and screen distance to reduce eye strain.—
Jason Phillips,
IndyStar,
11 Nov. 2025
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Adams drove the route through the warehouse-y section of Albuquerque that had been chosen for Scene 46, and saw that the way the shadows hit the car would inevitably create a shadow of the camera and of any lighting equipment on Seehorn’s face.—
Sarah Shachat,
IndieWire,
11 Nov. 2025
Noun
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Candle Warmer Lamp Set the mood with an elegant and unexpected candle-warming lamp.—
Jake Henry Smith,
Glamour,
11 Nov. 2025
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Walk out of a play’s shadows back into the clear light of day without a there to take with you, and even a burning cauldron will become little more than a brief candle.—
Sara Holdren,
Vulture,
10 Nov. 2025
Cite this Entry
“Illuminant.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/illuminant. Accessed 12 Nov. 2025.
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