Search Result for "megaton": 
Wordnet 3.0

NOUN (2)

1. a measure of explosive power (of an atomic weapon) equal to that of one million tons of TNT;

2. one million tons; 



WordNet (r) 3.0 (2006):

megaton
    n 1: a measure of explosive power (of an atomic weapon) equal to
         that of one million tons of TNT
    2: one million tons