dagger fern dag·ger·fern uncommon noun 1. North American evergreen fern having pinnate leaves and dense clusters of lance-shaped fronds SynonymsChristmas ferncanker brakedagger fernevergreen wood fernPolystichum acrostichoides Related words Broader terms fern Parts Polystichum WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
