- A word, phrase, or sentence that has the property of forming another word, phrase, or sentence when its letters are reversed. A semordnilap differs from a palindrome in that the word or phrase resulting from the reversal must be different from the original word or phrase.
Etymology: A reverse spelling of palindrome, palindromes. Macmillan http://www.macmillandictionary.com/new-words/031205-semordnilap.htm suggest that British author Michael Quinion may have been among the first to use the word, in May 2000. However, an http://www.anagrammy.com/anagrams/faq3.html anagrams FAQ page attributes it to Lewis Carrol.
- "desserts" and "stressed" are believed to be the longest common English semordnilaps.
- "diaper" and "repaid" are semordnilaps.
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