EULER is a 5 letter word that starts with E.
[Named after the Swiss mathematician Leonhard Euler (1707-1783)] A revision of algol by niklaus wirth. A small predecessor of pascal.
["EULER: A Generalisation of ALGOL and Its Formal Definition", N. Wirth, CACM 9(1) (Jan 1966) and 9(2) (Feb 1966)].