Lamium la·mium uncommon noun 1. genus of Old World herbs: dead nettles; henbits Synonymsgenus Lamium Related words Word family Lamium albumLamium amplexicaule Broader terms asterid dicot genus Parts Labiatae Part of dead nettlewhite dead nettlehenbit WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.