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An aircraft crew member in charge of loading and unloading cargo or heavy weapons.
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.
the crew member of an aircraft responsible for the cargo
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
load•mas•ter(ˈloʊdˌmæs tər, -ˌmɑ stər)
an aircrew member responsible for the loading and stowage of cargo aboard an aircraft.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
An Air Force technician qualified to plan loads, to operate auxiliary materials handling equipment, and to supervise loading and unloading of aircraft.
Dictionary of Military and Associated Terms. US Department of Defense 2005.