The Collaborative International Dictionary of English v.0.48:
mandrake root \mandrake root\ n. The root of the mandrake plant; used medicinally or as a narcotic; as a substance it is also called mandrake. [WordNet 1.5]WordNet (r) 3.0 (2006):
mandrake root n 1: the root of the mandrake plant; used medicinally or as a narcotic [syn: mandrake root, mandrake]