hypolithic
Also found in: Medical.
hy·po·lith·ic
(hī′pə-lĭth′ĭk)adj.
Being or inhabiting a largely lightless environment found beneath or on the lower surface of rocks: hypolithic algae.
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.