n. 1 a a poisonous umbelliferous plant, Conium maculatum, with fernlike leaves and small white flowers. b a poisonous potion obtained from this. 2 (in full hemlock fir or spruce) a any coniferous tree of the genus Tsuga, having foliage that smells like hemlock when crushed. b the timber or pitch of these trees.
[ OE hymlic(e) ]