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The Collaborative International Dictionary
Chay root

Chay root \Chay" root`\ [Tamil sh[=a]ya.] The root of the Oldenlandia umbellata, native in India, which yieds a durable red dyestuff. [Written also choy root.]

Wiktionary
chay root

n. The root of the ''Oldenlandia umbellata'', native to India, which yields a durable red dyestuff.