boulder fern boul·der·fern uncommon noun 1. fern of eastern North America with pale green fronds and an aroma like hay Synonymshay-scentedhay-scented fernscented fernboulder fernDennstaedtia punctilobula Related words Broader terms fern Parts Dennstaedtia WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
