Ba·ha·ul·lah (bä-hä?o?o-lä?) Originally Mirza Huseyn Ali. 1817-1892. Persian religious leader who was a follower of the Bab and founded the Baha’i religion (1863).[Arabic bah?’u ll?h, splendor of God : bah?’, splendor (from bah?, to become empty, become beautiful; see bhw in Semitic roots) + all?h, God; see Allah.]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.Ba?ha?ul?lah (b??h? ?l?l?) n. (Husayn ?Al?), 1817-92, Persian religious leader: founder of Baha’i. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.