bed moldingn.1. The molding between the corona and frieze of an entablature.2. A molding below a projecting part.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.bed? mold`ing n. 1. a molding or group of moldings immediately beneath the corona of a cornice. 2. any molding under a projection. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.