For some time I have been looking out for long palindromic words in the Oxford English Dictionary. I recently decided to try and find the longest palindromes in each letter of the alphabet, starting with A and working right through to Z. The results of this search are set out below. Reduplications such as TOOT-TOOT, WAW-WAW and TUT-TUT have not been included.
"Palindromes in the OED,"
Word Ways: Vol. 11
, Article 6.
Available at: http://digitalcommons.butler.edu/wordways/vol11/iss4/6