The Collaborative International Dictionary
Lamium album
Archangel \Arch`an"gel\, n. [L. archangelus, Gr. 'archa`ggelos: cf. OF. archangel, F. archange. See Arch-, pref., and Angel.]
A chief angel; one high in the celestial hierarchy.
--Milton.(Bot.) A term applied to several different species of plants ( Angelica archangelica, Lamium album, etc.).
Wikipedia
Lamium album
Lamium album, commonly called white nettle or white dead-nettle, is a flowering plant in the family Lamiaceae, native throughout Europe and Asia, growing in a variety of habitats from open grassland to woodland, generally on moist, fertile soils.