The Collaborative International Dictionary of English v.0.48:

Pachak \Pa*chak"\, n. (Bot.)
   The fragrant roots of the Saussurea Costus, exported from
   India to China, and used for burning as incense. It is
   supposed to be the costus of the ancients. [Written also
   putchuck.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Putchuck \Put*chuck"\, n. (Bot.)
   Same as Pachak.
   [1913 Webster]