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Of or relating to a lichen whose thallus is thin, crusty, and closely adherent to or embedded in the surface on which it grows.

[Latin crūstōsus, crusted, from crusta, crust; see kreus- in Indo-European roots.]
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 having a crustlike appearance: crustose lichens.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈkrʌs toʊs)

forming a crusty, tenaciously fixed mass that covers the surface on which it grows, as certain lichens.
[1875–80; < Latin crustōsus covered with a crust, derivative of crust(a) crust]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.crustose - (of lichens) having a thin crusty thallus that adheres closely to the surface on which it is growing; "crustose lichens"
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