China grass chi·nag·rass uncommon noun 1. tall perennial herb of tropical Asia with dark green leaves; cultivated for the fiber from its woody stems that resembles flax SynonymsramierameeChinese silk plantChina grassBoehmeria nivea Related words Broader terms false nettle Parts Boehmeria WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.