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What does ur- mean? Ur- is a combining form used like a prefix that has two unrelated senses. The first is “urine.” It is used occasionally in medical terms, especially in pathology. In some rare instances, like urate, ur- specifically denotes uric acid, a compound found in urine. This ur- comes from Greek oûron, meaning “urine.” Other combining forms that mean "urine," such as urino- and urin-, come from the Latin for "urine," ūrīn(a). The second is “earliest” or “original.” It is frequently used or appendaged to a wide variety of terms. In some instances, it is stylized with a hyphen after the form, as in ur-fascism. Because the German language capitalizes nouns, the combining form ur- sometimes appears as Ur-, as in Urheimat. This ur- comes from Old High German ur-, meaning “thoroughly.”Despite popular misconception, the name Uranus, a planet named for a Roman god, does not use the combining form ur- to mean "urine” or “earliest.” Discover more about the origins of this name at our entry for Uranus. The chemical compound uranium is also named after this figure from Greco-Roman mythology. What are variants of ur-?The “urine” sense of ur- are variants of uro-, which loses its -o- when combined with words or word elements beginning with vowels. Want to know more? Read our Words That Use uro- article. Note that uro- can also mean “tail.” It is occasionally used in scientific terms, especially in anatomy and zoology. This uro- ultimately comes from Greek ourá, meaning “tail.”
< German ur-, Middle High German, Old High German; cognate with Old English or-
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The court official said a warrant was out for the arrest of team manager Mujeeb Ur Rehman, a Pakistani national, who was also implicated in the case.
From Barron's ● Jan. 28, 2026
The region's city-states -- Ur, Uruk, and Lagash among them -- developed complex political and religious systems that became the blueprint for later societies.
From Science Daily ● Oct. 27, 2025
Rose only released her first single, the self-written and self-produced Say Ur Mine, two years ago.
From BBC ● Jun. 23, 2025
Syed Habib Ur Rehman works as a media coordinator at the Afghanistan Consulate General in Karachi.
From Seattle Times ● Apr. 28, 2024
From my pants pocket, my phone vibrated, and when I checked it William had sent me a text. “good movie. Ur mom mad?”
From "The Book of Unknown Americans" by Cristina Henríquez
UR: I’ve always liked Mary Kate and Ashley — they dress in all black but they’re just so stylish.
From Los Angeles Times ● Dec. 7, 2022
Richard Aslin, a complainant who held several leadership positions in his 33 years at UR, resigned in June over the university’s handling of the case.
From Slate ● Sep. 14, 2017
Note that this fever-dream mural is the work of the street-art collective UR New York, a veteran of Art Basel Miami.
From New York Times ● Jun. 6, 2013
The Man Booker International Prize 2013 UR Ananthamurthy Which of your books would you recommend to a reader approaching your work for the first time?Samskara.
From The Guardian ● May 14, 2013
The usual pronunciation is UR, but the upstart AIR, long considered a mistake, is now acceptable too.
From "Woe Is I" by Patricia T. O'Conner
And then one day at Camp Ponshewaing, Rebecca Ur- banus climbed up on a chair.
From "Middlesex: A Novel" by Jeffrey Eugenides
The prefix Ur-, moreover, I use in a deeper sense than is usually attached to it as in Urwald, Urwelt, and the like.
From The Centaur by Blackwood, Algernon
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
