Megaton

Noun

1. A measure of the strength of an explosion or a bomb based on how many million tons of TNT would be needed to produce the same energy. (A derived unit for TNT equivalent.)
2. One million tons. One million short tons (10⁶ × 2000 lb). One million long tons (10⁶ × 2240 lb). One million metric tons (10⁶ × 2204.6 lb).
3. One million short tons (10⁶ × 2000 lb).
4. One million long tons (10⁶ × 2240 lb).
5. One million metric tons (10⁶ × 2204.6 lb).