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.
Biochemistry. a region of DNA in which the sequence of nucleotides is identical with an inverted sequence in the complementary strand: GAATTC is a palindrome of CTTAAG.

1620–30; < Greek palíndromos recurring, equivalent to pálin again, back + -dromos running (see -drome)

palindromist [puh-lin-droh-mist] , noun
palindromic [pal-in-drom-ik, -droh-mik] , palindromical, adjective
palindromically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
palindrome (ˈpælɪnˌdrəʊm)
a word or phrase the letters of which, when taken in reverse order, give the same word or phrase, such as able was I ere I saw Elba
[C17: from Greek palindromos running back again, from palin again + -drome]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"a line that reads the same backward and forward," c.1629, from Gk. palindromos "a recurrence," lit. "a running back," from palin "again, back" (from PIE base *kwel- "move round," with notion of "revolving; see cycle) + dromos "a running."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

palindrome pal·in·drome (pāl'ĭn-drōm')
A segment of double-stranded DNA in which the nucleotide sequence of one strand reads in reverse order to that of the complementary strand.

pal'in·dro'mic (-drō'mĭk, -drŏm'ĭk) adj.

palindromic pal·in·dro·mic (pāl'ĭn-drō'mĭk, -drŏm'ĭk)
Relapsing; recurring.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
The palindromic chant challenges listeners to decide for themselves.
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