palindrome
noun
a word, line, verse, number, sentence, etc., reading the same backward as forward, as Madam, I'm Adam or Poor Dan is in a droop.
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We have a few fragments of his poems, but none of them are palindromical.
From Notes and Queries, Number 219, January 7, 1854 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc by Various