Pennycress meaning

pĕn'ē-krĕs'
Any of several plants of the genus Thlaspi of the mustard family, having small round flattened seedpods, especially the Eurasian species T. arvense, a weed naturalized throughout North America.
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Any of several plants, of the genus Thlaspi, that have flattened seedpods (in the form of an old penny)
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Origin of pennycress