DEAD-NETTLE, in botany, a genus of the didynamia gymnospermia clas. The superior labium is entire and vaulted; the inferior one consists of two lobes; in the margin of the faux on each side there is a remarkable tooth. There are eight species, three of them natives of Britain, viz. the album, or white dead-nettle; the rubrum, or red dead nettle; and the amplexicaule, or great henbit.