curly grass cur·lyg·rass uncommon noun 1. rare small fern of northeastern North America having numerous slender spiraling fronds and forming dense tufts Synonymscurly grasscurly grass fernSchizaea pusilla Related words Word family curly grass fern Broader terms fern Parts Schizaea WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.