Middle High German.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for mhg
The two f sounds thus fell together when final, but the distinction between the two sounds was still preserved in MHG.
All the nouns belonging to the u-declension went over into other 37 declensions in MHG.
British Dictionary definitions for mhg
Middle High German
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012