hapax legomenon (HAY-paks li-GOM-uh-non) noun, plural hapax legomena A word or form that has only one recorded use. [From Greek hapax (once) + legomenon, from legein (to say).] "Linda Tripp, the faithless friend, says to Monica Lewinsky about the President, `Right now I think he's a schwonk.' This qualifies as what is called  a hapax legomenon, the only known use in print, which makes it difficult to define." William Safire, Where's the Poetry?, The New York Times, Nov 1, 1998.