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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Ours featured an enormous (and very comfy) bed with a rattan headboard, tasteful brass lamps, a plush green velvet armchair and a writing desk with views out over the camellia trees.—
Irenie Forshaw,
TheWeek,
19 Mar. 2026
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Last Minute Leprechaun Tricks Overturn some of the furniture or move notable items such as lamps or pictures out of their normal places.—
Amanda Rock,
Parents,
16 Mar. 2026
Noun
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Ultraviolet light from its host star triggers the creation of sulfur dioxide in the upper atmosphere, and a massive sub-surface magma ocean acts as a buffer, storing and releasing volatile gases over billions of years.—
Mrigakshi Dixit,
Interesting Engineering,
16 Mar. 2026
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Use the dome light and flashers to make your vehicle more noticeable.—
NC Weather Bot,
Charlotte Observer,
16 Mar. 2026
Noun
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Remember, a tent offers no protection from lighting.—
NC Weather Bot,
Charlotte Observer,
16 Mar. 2026
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Both Stein and Gruver suggest warm, 2700K bulbs for bedroom lighting.—
Kristina McGuirk,
Better Homes & Gardens,
15 Mar. 2026
Noun
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Use our crepe paper flower how-to for paper ones, or make a beautiful blooming branch from candle wax.—
Shagun Khare,
Martha Stewart,
16 Mar. 2026
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This particular candle, as in the first-stage booster, was flying for the sixth time and made another successful recovery landing downrange on the droneship Just Read the Instructions stationed in the Atlantic.—
Richard Tribou,
The Orlando Sentinel,
14 Mar. 2026
Cite this Entry
“Illuminant.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/illuminant. Accessed 21 Mar. 2026.
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