nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A North American evergreen fern (Polystichum acrostichoides) having pinnate leaves and dense clusters of lance-shaped fronds. Also called canker brake, dagger fern.