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(Historical Terms) a raider in the border country of England and Scotland in the mid-17th century
[C17 moss, in northern English dialect sense: bog]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈmɔsˌtru pər, ˈmɒs-)

1. a marauder who operated in the mosses, or bogs, of the border between England and Scotland in the 17th century.
2. any marauder.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
BALTINGLASS native Shane Jackson was last weekend handed the jump jockey encouragement award at the Australian Jump Racing Association's annual Mosstrooper awards.
A mosstrooper was the name given to a raider on the border of which two countries?
A fortnight later Megapixel gave him victory in Bendigo's A$100,000 Mosstrooper Chase, 11th in an 18-leg series of feature races run in Victoria that all the above are from and in which he finished fourth behind Pateman, Allen and local rider Brad McLean.
His run began in May when steering Fareer to victory in the AUS$100,000 3YB Scotty Stewart Brierly Chase over 2m1f at Warrnambool and continued with Megapixel landing Sandown's 2m1f Australian Chase and Bendigo's 2m2f AJRA Mosstrooper Chase, both of the same value as the Brierly.
This level of crime and illegal trade caused the borders to be portrayed as a land of 'mosstroopers, theves, robbers and other wicked and lawlesse persons who convocat themselves together in hostile furitour'.