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.]
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Saussurea costus
n : annual herb of the eastern Himalayas (Kashmir) having purple
florets and a fragrant root that yields a volatile oil
used in perfumery and for preserving furs [syn: costusroot,
Saussurea lappa]