amtrac
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am·trac
also am·track (ăm′trăk′)n.
A small, flatbottom amphibious vehicle that moves by means of finned tracks and is used to carry troops from ship to shore.
[am(phibious) + trac(tor).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
amtrac
(ˈæmˌtræk) oramtrack
n
an amphibious tracked vehicle used primarily by the military for shore landings
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014