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n. pl. ma·zae·di·a (-dē-ə)
A fruiting body of some lichens in which the spores lie freely in a powdery mass that is enclosed in a peridium.
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.
(Biology) biology a powdery mass of ascospores found within the peridium of certain lichen
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014