1. A word, phrase, verse, or sentence that reads the same backward or forward. For example: A man, a plan, a canal, Panama!
2. A segment of double-stranded DNA in which the nucleotide sequence of one strand reads in reverse order to that of the complementary strand.
[From Greek palindromos, running back again, recurring : palin, again; see kwel-1 in the Appendix of Indo-European roots + dromos, a running.]
pal′in·dromic (-drōmĭk, -drŏmĭk) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.