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A regift. A relatively trivial object that has repeatedly been given as a present. Strictly, a mathom is probably NOT an object with a tendency to decay (i.e. fruitcake), nor an object of obviously poor construction (i.e. a crooked handmade sweater or junk), nor a family heirloom or a useful "hand-me-down" article (i.e. toddler clothing), nor one which requires expensive upkeep (i.e. a large, exotic pet -- a proveribial white elephant).
Such objects most likely persist because they are slightly too valuable or unusual to dispose of outright or give to Goodwill, yet have such limited use or appeal that few wish to retain them. Modern-day candidates for mathomhood are commonly visible in catalogs for novelty electronics, pop art, junk jewelry, and sports memorabilia, as well as in roadside "local" gift stores.
"It was a tendency of hobbit-holes to get cluttered up; for which the custom of giving so many birthday-presents was largely responsible. Not, of course, that the birthday-presents were always new; there were one or two old mathoms of forgotten uses that had circulated all around the district; but Bilbo had usually given new presents and kept those that he received."

-- J.R.R. Tolkien, The Fellowship of the Ring, p. 65.
mathom by Alf112 January 1, 2007
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A term coined by JRR Tolkien, meaning an object given as a present to someone who does not want it. This person then gives it to someone else at an appropriate occasion. The object passes to the majority of people in the area over time, becoming a mathom.
In these days of commercialization, no one thinks to use mathoms as Christmas presents...
mathom by Curuniel December 28, 2003
Related Words
mathom mathmo mathos Matoom matham mathob mathok Mathou Mathum Dorjee Matho
In the University of Cambridge, a mathmo is a student who studies mathematics.
Get a mathmo to help you
mathmo by dmn October 7, 2004
The mathematical equivalent of a typo; a small-but forgivable mathematical error caused by the fumbling of such things as keys, pencils, or entire measurement systems.
"Why did that space probe burn up in the atmosphere?"
"Sorry, my bad, made a matho."
"Oh, okay then."
matho by BazzaTBumbler August 4, 2021
A name you give to someone for comitting plagiarism excessively and posting other peoples songs or videos on their blog without giving the original artists credit.
Person 1: "I downloaded that song I showed you the other day and posted it on my Newgrounds profile without giving the artists credit!"

Person 2: "Wow, you're a bit of a Mathum aren't you?"
Mathum by David Stead January 26, 2009

Dorjee Matho 

He’s the hottest guy out there and he will get any girl he wants, he’s very funny and kind but if you annoy him he can get a little m_e_a_n
Omg I love you because ur a sexy ass Dorjee Matho
Dorjee Matho by Cryzmm May 20, 2019
A genre of music that merges the complexity of math-rock with the saccharine melodrama of emo punk, i.e. math + pathos.
The kids came to the show to mosh, but left in tears due to the high mathos content.
mathos by Benvie October 21, 2007