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say it: MEG-uh-tuhn
megaton is a noun meaning "a measure of explosive power (of an atomic weapon) equal to that of one million tons of TNT". It carries 2 recorded senses.
a measure of explosive power (of an atomic weapon) equal to that of one million tons of TNT
one million tons
Forms marked are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for megaton come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.