pennycress noun1 •Any of several plants, of the genus Thlaspi, that have flattened seedpods (in the form of an old penny).“What on earth did you put in that stuff?” “Bug-bane, barren-wort, penny-cress and blood-root, catchfly, toad-flax, nap-weed and wormwood,” said Catweazle. — 1970 formspennycresses
