If you google your question you'll get an answer. Or typr PALINDROME in the AB search box as it was discussed on here a month or two ago. I can only remamber MADAM I'M ADAM and Able was I, I saw Elba
The longest palindromic word in the Oxford English Dictionary is the onomatopoeic tattarrattat, coined by James Joyce in Ulysses (1922) for a knock on the door.
odotenetmulummadidammappamtenetannaannatenetm
appammadidammulumtenetodo
latin for odo holds a muleanna holds a wet drippingnapkinanna holds a wet dripping napkin odo holds a mule There you go