either of two small, delicate, light-green spleenwort ferns (Asplenium cryptolepis or A. rutamuraria) usually growing on cliffs or walls in North America and Europe
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.