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n. A word or form that occurs only once in the recorded body of a given language.
schwonk: an uneducated phrase or comment.
UD goons might want to put that one in the archive.....
©uh-uh-uh
noun (pl. hapax legomena or hapaxes)
A word that appears only once in a text corpus or body of writing—be this a particular author's oeuvre, a work of substantial length, or a language's entire collection of writing, including the Twittersphere.
From Ancient Greek hápax legómenon ("thing once said").
The old Ottoman Governments regarded this clan of manticratic peers with a mixture of reverence and distrust.
—T. E. Lawrence, 1926
Despite the constant negative press covfefe
—Donald Trump producing a hapax legomenon of his own, 2017
A Hapax legomenon is a word or expression that only occurs one time.
This can be abbreviated as Hapax.
There is this one word in a book that I found that is only mentioned once. This is an Hapax legomenon.