Wei 1 (w?) Name of several Chinese dynasties ruling from ad 220 to 265 and from 386 to 556.Wei 2 (w??) or Wei·he (-h??) A river of central China flowing about 850 km (530 mi) generally eastward through Shaanxi province to the Yellow River.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.Wei (we?) n. any of several dynasties that ruled in North China, esp. one ruling A.D. 220?265 and one ruling A.D. 386?534. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.