Definition of "wormseed" [worm•seed]

• A tropical American plant (Chenopodium ambrosioides) yielding an oil used as an anthelmintic. Also called epazote, Jerusalem oak, Mexican tea. (noun)
• Any of several other plants used as an anthelmintic. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Epazote (wormseed) chenopodium ambrosioides: This hardy perennial, with its resinous fragrance and serrated, tapering leaves, grows wild in many parts of Mexico and the United States, especially California."
• "Herbs and vegetables such as nopales (cactus paddles), verdolagas (purslane), berros (watercress) and epazote (wormseed) have traditionally been used to lend a distinctive flavor to the local cooking, as have chiles and seeds, notably pumpkin and sesame."
• "The most specific treatment for roundworms, however, is chenopodium oil made from the American wormseed Chenopodium ambrosioides var. anthelminticum."