From Longman Dictionary of Contemporary Englishpalindromepal‧in‧drome /ˈpæləndrəʊm $ -droʊm/ noun [countable] SLa word or phrase such as ‘deed’ or ‘level’, which is the same when you spell it backwards
Examples from the Corpus
palindrome• Sometimes a palindrome is used together with other non-mirrored material and especially in this case the mirroring is not perceived by the listener.Origin palindrome (1600-1700) Greek palindromos, from palin “back, again” + dramein “to run” 