Depravity and Purgatives

turpeth, (tur/pith), n. the root of a convolvulaceous plant, Operculina turpethum, formerly used as a purgative.

Turpin, (tur/pin) n. Richard (Dick), 1706-1739 English highwayman.

turpitude,(tur/pi tyood), n. vile, shameful or base of character; depravity.

The Random House Dictionary of the English Language, The Unabridged Edition [1966]