MEGATON BOMB • DICCIONARIO INGLES.COM • Definition of Megaton bomb

... because they have what amounts to a religious taboo against landing anywhere and leaving without stealing something. The real loot was at these two other towns; a steel mill and big stocks of steel at one, and all that skunk-apple oil at the other. So what did they do? They dropped a five-megaton bomb on each one, and blew both of them to Em-See-Square. That was a terror-raid pure and simple, but as Boake inquires, just who were they terrorizing? If there were big cities somewhere else on the planet, it would figure. ...

— Space Viking • Henry Beam Piper