Merriam-Webster's Word of the Day for November 18, 2025 is:
eccentric • \ik-SEN-trik\ • adjective
Eccentric usually describes people and things that deviate from conventional or accepted usage or behavior, especially in odd or whimsical ways. It is also used technically to mean "deviating from a circular path" and "located elsewhere than at the geometric center."
// He's an endearingly eccentric scientist whose methods are quite inventive.
// The dwarf planet Pluto has an eccentric orbit.
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Examples:
"The film [Annie Hall] is considered one of the great romantic comedies of all time, with [Diane] Keaton's eccentric, self-deprecating Annie at its heart." — Eva Roytburg, Fortune, 11 Oct. 2025
Did you know?
Eccentric was originally a technical term at home in the fields of geometry and astronomy. It comes from the Medieval Latin adjective ecentricus, meaning "not having the earth at its center," and ultimately has its root in a Greek noun, kéntron, whose various meanings include "stationary point of a pair of compasses" and "midpoint of a circle or sphere." But its figurative use is long-established too: as far back as the 17th century the word has been used to describe people and things that deviate from what is conventional, usual, or accepted.
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crucible
Merriam-Webster's Word of the Day for November 17, 2025 is:
crucible • \KROO-suh-bul\ • noun
A crucible, in the word’s literal use, is a pot in which metals or other substances are heated to a very high temperature or melted. But crucible is more often encountered in figurative use referring to a difficult test or challenge, or to a place or situation that forces people to change or make difficult decisions.
// The bronze was heated to 2,100 degrees in the crucible and then poured into molds designed by the artist.
// Her latest novel follows two best friends in a fantastical, battle-ravaged kingdom who emerge from the crucible of war with opposing views and values on what should come next.
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Examples:
“... the original film follows four married couples—close friends who reunite once a year for a weeklong vacation together. On the surface, the retreat is meant to help them relax and reconnect, but it quickly becomes a crucible for examining the cracks in their relationships.” — Matt Grobar, Deadline, 1 Oct. 2025
Did you know?
Unless you’re studying Arthur Miller’s The Crucible in school, it may not be crucial to learn the story behind crucible, but it can’t hurt! Crucible looks like it should be closely related to the Latin combining form cruc- (“cross”); however, unlike crucial, it isn’t. It was forged instead from the Medieval Latin crucibulum, a noun for an earthen pot used to melt metals, and in English it first referred to a vessel made of a very heat-resistant material (such as porcelain) used for melting a substance that requires a high degree of heat. It’s possible that the resemblance between cruc- and crucible encouraged people to start using crucible to mean “a severe trial,” as that sense is synonymous with one meaning of cross, but the idea of simmering in a literal crucible also sounds plenty severe. The newest sense of crucible (“a situation in which great changes take place,” as in “forged in the crucible of war”) recalls the fire and heat required to transform some solids into liquids.
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writhe
Merriam-Webster's Word of the Day for November 16, 2025 is:
writhe • \RYTHE\ • verb
To writhe is to twist one’s body from side to side. The word is often used when the body or a bodily part is twisting in pain.
// The injured player lay on the football field, writhing in pain.
// At the instruction of their teacher, the children rolled the fallen log aside to reveal worms and other small critters writhing in the soft earth.
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Examples:
“The creatures named after writers are mostly bugs, which makes sense. There are a lot of those little guys writhing around, and I imagine most of them escaped our attention for long enough that science had to start reaching for new names. And a lot of them are wasps: Dante has two wasps named after him; Marx has two, Didion has one, Dickens has two, Zola has two, Thoreau has seven, and Shakespeare has three wasps and a bacterium. Nabokov has a lot of butterflies, naturally.” — James Folta, LitHub.com, 25 Aug. 2025
Did you know?
Writhe wound its way to us from the Old English verb wrīthan, meaning “to twist,” and that ancestral meaning lives on in the word’s current uses, most of which have to do with twists of one kind or another. Among the oldest of these uses is the meaning “to twist into coils or folds,” but in modern use writhing is more often about the physical contortions of one suffering from debilitating pain or attempting to remove oneself from a tight grasp (as, say, a snake from a hawk’s talons). The word is also not infrequently applied to the twisting bodies of dancers. The closest relation of writhe in modern English lacks any of the painful connotations often present in writhe: wreath comes from Old English writha, which shares an ancestor with wrīthan.
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radial
Merriam-Webster's Word of the Day for November 15, 2025 is:
radial • \RAY-dee-ul\ • adjective
Radial describes things that are arranged or have parts arranged in straight lines coming out from the center of a circle.
// Her mosaics echo radial patterns observed in nature, from succulents to sea urchins.
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Examples:
"Inspired by flowers that grow organically, the project transforms organic patterns into space arrangements, embodying the idea of blooming. The design distills the essence of a flower's radial symmetry into a geometric language, creating a rhythmic play of radial patterns and sunburst lines." — Architecture Update (India), 19 Feb. 2025
Did you know?
Picture the sun shining brightly on a cloudless day. Its rays stretch in every direction along radiant radii so far-reaching they radiate daylight. It's pretty rad, and it's a cinch to describe in English thanks to the expansive influence of the Latin noun radius, meaning "ray." As you might have guessed, radius is an ancestor of the English words ray, radiant, radiate, and of course radius. It's also the sunny source of radial, which joined our language in the 1500s as an adjective meaning "arranged or having parts arranged like rays." Radial has bourgeoned in meaning over the centuries, adopting unique applications across many fields including medicine, engineering, and astronomy.
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heyday
Merriam-Webster's Word of the Day for November 14, 2025 is:
heyday • \HAY-day\ • noun
Heyday refers to the period of one's greatest popularity, vigor, or prosperity. It is usually used in the singular.
// In its heyday, the circus was a major form of entertainment for the small town.
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Examples:
"In its heyday, there were more than 200 Chi-Chi's nationwide; the last restaurant closed in 2004." — Nicole Hvidsten, The Minnesota Star Tribune, 1 Oct. 2025
Did you know?
The day in heyday originally had nothing to do with the kind of day that's made up of 24 hours. Heyday was first used in the first half of the 16th century as an extended form of the interjection hey, used since the 13th century to express elation or wonder, as it still often is in phrases like "hey, look at that!" The day part was most likely just an extra syllable tagged on for effect. By the end of the 16th century heyday had developed noun use with the meaning "high spirits," as when Shakespeare's Hamlet tells his mother, "You cannot call it love; for at your age / The heyday in the blood is tame …” It wasn't until the 18th century that the day syllable's resemblance to the word day likely influenced the development of the now-familiar use referring to the period when one's achievement or popularity has reached its zenith.
Brasil