What is the longest one word palindrome?
The longest palindrome in the dictionary is TATTARRATTAT (12 letters), a word made up by James Joyce to indicate the sound of someone knocking on the door. The word DETARTRATED (11 letters) is also considered by some to be a word. It is a chemical term. Another long one is KINNIKINNIK (11 letters), a type of tobacco substitute used by North American Indians.
