any of several plants belonging to herbs of the genus Thlaspi, of the mustard family, especially T. arvense, of Europe, bearing somewhat round, flat pods.
Also, penny cress, penny-cress.

1705–15; penny + cress Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pennycress (ˈpɛnɪˌkrɛs)
any of several plants of the genus Thlaspi of temperate Eurasia and North America, typically having small white or mauve flowers and rounded or heart-shaped leaves: family Brassicaceae (crucifers)

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica


(genus Thlaspi), plant of the mustard family (Brassicaceae), named and sometimes grown for its round seedpods. Most of the 60 species are Eurasian, but a few are native to North and South America, mostly in mountain areas. Common pennycress, or field pennycress (T. arvense), has penny-shaped (flattened and circular) notched pods, which are borne on stalks along the spike; at the ends of the spikes are small, white, four-petaled flowers

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The oil expelling and extruding process is still on-going for lesquerella, pennycress and cuphea.
Field pennycress seed meal applied at similar rates did not suppress weeds.
Historically, pennycress has been a bane to farmers.
One of the plants being used is alpine pennycress, a wild perennial herb found on zinc- and nickel- rich soils in many countries.
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