genus Argyroxiphium ge·nu·sar·gyroxiphium uncommon noun 1. small genus of Hawaiian spreading and rosette-forming shrubs SynonymsArgyroxiphiumgenus Argyroxiphium Related words Broader terms asterid dicot genus Parts Compositae Part of silversword WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.