Definition of "turbith"

turbith

noun
uncountable
1. A type of purgative drug made from the root of a type of morning glory plant (Operculina turpethum); or the plant itself.
  Quotations
  […] turbith, agarick, mirabolanes, hermodactils from the East Indies, tobacco from the West […]
  1624, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy: […], 2nd edition, Oxford, Oxfordshire: Printed by John Lichfield and James Short, for Henry Cripps