Lambkill \Lamb"kill`\, n. (Bot.)
A small American ericaceous shrub ({Kalmia angustifolia}),
resembling mountain laurel but having narrower leaves and
small red flowers; -- called also {calfkill}, {sheepkill},
{sheep laurel}, etc. It is supposed to poison young sheep and
other animals that eat it at times when the snow is deep and
they cannot find other food.
Syn: sheep laurel, pig laurel, {Kalmia angustifolia}.
[Webster 1913 Suppl. + WordNet 1.5]