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Douglas Harper's Etymology Dictionary
gigaton

by 1977, from giga- + ton.

Wiktionary
gigaton

n. 1 A measure of the strength of an explosion or a bomb based on how many billion tons of TNT would be needed to produce the same energy. 2 One billion tons

Usage examples of "gigaton".

Let us ignore, for a moment, the gigaton gigantism of present-day arsenals and reflect on what a single megaton could do: it could visit Hiroshima-scale destruction on every state capital in America, with about thirty bombs to spare.

Let it pick up gigatons of water, bring it back to Mars, cut into the trunk and let sap bleed out.

His homeland no longer exists in any form, save for gigatons upon gigatons of dangerous, prettily colored rocks.

We've been pouring greenhouse gases into the atmosphere by the gigaton.