What does "wolfsbane" mean?

Wolfsbane: A poisonous plant (Aconitum Lycoctonum), a kind of monkshood; also, by extension, any plant or species of the genus Aconitum. See Aconite. WOLF'S-CLAW Wolf's"-claw`, n. (Bot.) A kind of club moss. See Lycopodium. WOLF'S-FOOT Wolf's"-foot`, n. (Bot.) Club moss. See Lycopodium. WOLF'S-MILK Wolf's"-milk`, n. (Bot.) Any kind of spurge (Euphorbia); -- so called from its acrid milky juice.