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Hapax legomenon

It's part of a dictionary entry for the phrase "hapax legomenon".  It means a word or phrase that appears only once in a manuscript, document or particular area of literature.   From the Greek for "(thing) once said."

Here's another interesting dictionary entry; "callipygean". It means "having beautiful or shapely buttocks".  Can you believe there's a word just for that?  Try slipping it into the conversation at your next party.

And here's another interesting word for you; "cleave".  This can mean either to split apart or to join together.