What is "thymoquinone"

n. (context organic compound English) A monoterpenoid quinone, found in caraway, coriander and nutmeg, that has antioxidant activity

Thymoquinone is a phytochemical compound found in the plant Nigella sativa. It is also found in select cultivated Monarda fistulosa plants grown and steam distilled in the USA producing an essential oil.