often attributive
1
a
: a sharp rigid process on a plant
especially : one that is a short, indurated, sharp-pointed, and leafless modified stem compare prickle, spine
b
: any of various sharp spinose structures on an animal
2
: a woody plant bearing sharp impeding processes (such as prickles or spines)
especially : hawthorn
3
: something that causes distress or irritation
often used in the phrase thorn in one's side
4
: the runic letter þ used in Old English and Middle English to represent either of the fricatives \th\ or \t͟h\ and in Icelandic to represent \th\
thorned adjective
thornless adjective
thornlike adjective

Examples of thorn in a Sentence

your constant questions are a thorn in my side
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Flynn has persistently been a thorn in the side of Wu all year, and some of his proposals are legit. Joe Battenfeld, Boston Herald, 27 Sep. 2025 And with a team that has not been the biggest thorn in their side over the last 15 seasons. Jon MacHota, New York Times, 24 Sep. 2025 Though often a thorn in conservatives’ side, Kennedy nevertheless regularly voted with the court’s right-leaning bloc. Maureen Groppe, USA Today, 23 Sep. 2025 Andrew Greif The Chiefs receiver just made a highlight-worthy catch to put his team in position to score a touchdown and extend its lead to 22-9, but he's been a thorn in the side of New York's defense all night, with five catches for 71 yards, including a touchdown. Andrew Greif, NBC news, 22 Sep. 2025 See All Example Sentences for thorn

Word History

Etymology

Middle English, from Old English; akin to Old High German dorn thorn, Sanskrit tṛṇa grass, blade of grass

First Known Use

before the 12th century, in the meaning defined at sense 2

Time Traveler
The first known use of thorn was before the 12th century

Browse Nearby Words

Cite this Entry

“Thorn.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thorn. Accessed 6 Oct. 2025.

Kids Definition

thorn

noun
1
: a woody plant bearing sharp processes (as prickles or spines)
especially : hawthorn
2
: a sharp stiff process on a plant
especially : a stem modified into a short, stiff, and leafless sharp point
3
: something or someone that causes distress or irritation
often used in the phrase thorn in one's side
thorned adjective
thornless adjective

More from Merriam-Webster on thorn

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!