birthwort: creeping plant having curving flowers thought to resemble fetuses; native to Europe; naturalized Great Britain and eastern North America
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
nortriptyline: a tricyclic antidepressant drug (trade name Pamelor) used along with psychotherapy to treat dysthymic depression; may interact dangerously if taken with other drugs