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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Remove any dust and cobwebs from the ceiling, walls, fans, and corners of the room before moving on to dusting the shelves, picture frames, lamps, and other decorations.—
Daley Quinn,
Southern Living,
26 Sep. 2025
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Level up your late nights at the computer with 40% off a task lamp that features a swivel arm, dual charging ports, and an adjustable shade.—
Audrey Lee,
Architectural Digest,
25 Sep. 2025
Noun
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There's also a front light with an auto-adjusting sensor on board, so the screen should be legible indoors and out.—
New Atlas,
New Atlas,
1 Oct. 2025
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Blue light targets acne-causing bacteria to help keep breakouts at bay, while red and near-infrared wavelengths penetrate deeper to stimulate collagen, improve circulation, and promote skin repair.—
Conçetta Ciarlo,
Vogue,
1 Oct. 2025
Noun
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The restaurant’s minimalist design, from the pale wood furniture to the soft globe lighting, feels warm thanks to earthy textures and abundant natural light, creating a calm, modern space, perfect for enjoying a meal.—
Evan Moore,
Charlotte Observer,
30 Sep. 2025
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With military modifications, the MRZR can also include infrared and blackout lighting, greater range and collapsible roll cages for internal transport in helicopters and on naval vessels.—
Mars King,
Twin Cities,
30 Sep. 2025
Noun
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The life span of the batteries used in your flameless candle varies depending on battery type, candle model and usage.—
BestReviews,
Mercury News,
30 Sep. 2025
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Then fill the candle with water, leaving enough space for the wax to float to the top.—
Brandee Gruener,
Southern Living,
30 Sep. 2025
Cite this Entry
“Illuminant.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/illuminant. Accessed 2 Oct. 2025.
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