Argyroxiphium ar·gy·ro·xiphium uncommon noun 1. small genus of Hawaiian spreading and rosette-forming shrubs Synonymsgenus Argyroxiphium Related words Word family Argyroxiphium sandwicense Broader terms asterid dicot genus Parts Compositae Part of silversword WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.