Middle Low German
Middle Low German definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
the Low German language as written and spoken between c. 1100 and c. 1500
Middle Low German definition by American Heritage Dictionary
Low German from the middle of the 13th through the 15th century.