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amtrac

or am·track

[am-trak]
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noun
  1. amphibian(def 4).

Origin of amtrac

First recorded in 1940–45; am(phibious) + trac(tor)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for amtrac

n.

amphibious assault vehicle, 1944, from amphibious + tractor.

Online Etymology Dictionary, © 2010 Douglas Harper