noun.
A Mediterranean plant (Eruca vesicaria subsp. sativa) of the mustard family, having flowers with purple-veined, yellowish-white petals and pungent, edible leaves.
the GNU version of the Collaborative International Dictionary of English
noun.
an erect European annual (Eruca vesicaria sativa) of the mustard family, often grown as a salad crop to be harvested when young and tender.