turpeth

turpeth

[tur-pith]
noun
1.
the root of an East Indian plant, Merremia (or Operculina ) turpethum, of the morning glory family, formerly used as a purgative.
2.
the plant itself.

Origin:
1350–1400; < Medieval Latin turpethum < Arabic turbid < Persian; akin to Sanskrit tripuṭā; replacing Middle English turbit(h)(e) < Old French turbit(h) < Arabic turbid, as above

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World English Dictionary
turpeth (ˈtɜːpɪθ)
 
n
1.  a convolvulaceous plant, Operculina turpethum, of the East Indies, having roots with purgative properties
2.  the root of this plant or the drug obtained from it
 
[C14: from Medieval Latin turbithum, ultimately from Arabic turbid]

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