Polystichum aculeatum po·lys·tic·humaculeatum uncommon noun 1. tropical Old World fern having glossy fronds suggestive of holly; sometimes placed in genus Polystichum Synonymsholly fernCyrtomium aculeatumPolystichum aculeatum Related words Broader terms fern WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
