Short for amphibious tractor, a specialized military vehicle designed to operate on both land and water.
Blend word created from 'amphibious' and 'tractor,' shortened and formalized into 'amtrac.' The term became standard in US Marine Corps nomenclature during World War II.
Amtracs were absolutely crucial in Pacific island-hopping during WWII—they let soldiers drive directly from ships onto beaches, which changed amphibious warfare forever!
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