-plasmsuff. Material forming cells or tissue: cytoplasm.[From plasma.]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.-plasm n combining form (in biology) indicating the material forming cells: protoplasm; cytoplasm. [from Greek plasma something moulded; see plasma] -plasmic adj combining formCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014plasm- var. of plasmo- before a vowel: plasmapheresis. -plasm a combining form with the meanings ?living substance,? ?tissue,? ?substance of a cell?: cytoplasm; neoplasm. [comb. form representing Greek plásma. See plasma] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.