ˈpalə̇nˌdrōm noun
( -s )
Etymology: Greek palindromos running back again, from palin back, again + -dromos -drome
1.
a. : a word, verse, or sentence (as “Able was I ere I saw Elba”) that reads the same backward or forward
b. : word square 2
2. : a number (as 18181) that expressed in arabic numerals has the same value when reversed