Also found in: Wikipedia.
An extremely fine synthetic fiber that can be woven or knit into textiles with the texture and drape of natural-fiber cloth but with enhanced washability, breathability, and water repellancy.
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.
mi•cro•fi•ber(ˈmaɪ kroʊˌfaɪ bər)
a very fine polyester fiber, weighing less than one denier per filament, used esp. for clothing.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.