Dictionary.com
definitions

Medieval Greek

noun
  1. the Greek language of the Middle Ages, usually dated a.d. 700 to 1500. Abbreviation: MGk, MGk., MGr.
Also called Middle Greek.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for medieval greek

Medieval Greek

noun
  1. the Greek language from the 7th century ad to shortly after the sacking of Constantinople in 1204Also called: Middle Greek, Byzantine Greek Compare Koine, Late Greek, Ancient Greek
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