palindrome (n.) Look up palindrome at Dictionary.com
"line that reads the same backward and forward," 1620s, from Greek palindromos "a recurrence," literally "a running back," from palin "again, back" (from PIE *kwle-i-, from root *kwel- (1) "move round," with notion of "revolving;" see cycle (n.)) + dromos "a running" (see dromedary). Related: Palindromic.