A·li Ba·ba (ä?l? bä?b?, ?l??)n. A poor woodcutter in the Arabian Nights who gains entrance to the treasure cave of the 40 thieves by saying the magic words “Open, Sesame!”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.Ali Baba (?æl? ?b??b?) n (Literary & Literary Critical Terms) (in The Arabian Nights’ Entertainments) a poor woodcutter who discovers that the magic words “open sesame” will open the doors of the cave containing the treasure of the Forty ThievesCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014A?li Ba?ba (?? li ?b? b?, ?æl i ?bæb ?) n. the poor woodcutter, hero of a tale in The Arabian Nights’ Entertainments, who uses the magic words ?Open sesame? to open the door to the cave in which the Forty Thieves have hidden their treasure. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.