Musquash Mus"quash, n. [American Indian name.] (Zo["o]l.) See Muskrat. Musquash root (Bot.), an umbelliferous plant (Cicuta maculata), having a poisonous root. See Water hemlock., Hemlock Hem"lock, n. [OE. hemeluc, humloc, AS. hemlic, hymlic.] 1. (Bot.) The name of several poisonous umbelliferous herbs having finely cut leaves and small white flowers, as the Cicuta maculata, bulbifera, and virosa, and the Conium maculatum. See Conium. Note: The potion of hemlock administered to Socrates is by some thought to have been a decoction of Cicuta virosa, or water hemlock, by others, of Conium maculatum. 2. (Bot.) An evergreen tree common in North America (Abies, or Tsuga, Canadensis); hemlock spruce. The murmuring pines and the hemlocks. --Longfellow. 3. The wood or timber of the hemlock tree. Ground hemlock, or Dwarf hemlock. See under Ground., Cowbane Cow"bane` (kou"b[=a]n`), n. (Bot.) A poisonous umbelliferous plant; in England, the Cicuta virosa; in the United States, the Cicuta maculata and the Archemora rigida. See Water hemlock.