noun.
A low-growing plant (Asperugo procumbens) with small blue flowers, native to Eurasia and naturalized in North America.
noun.
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The Century Dictionary and Cyclopedia
noun.
A plant of the genus Alyssum.
noun.
[As if a contraction of madderwort, having been used as a substitute for madder.] A plant of the borage family, Asperugo proeumbens, whose root was used like madder: commonly called German madwort.
the GNU version of the Collaborative International Dictionary of English
noun.
A genus of cruciferous plants (Alyssum) with white or yellow flowers and rounded pods. Alyssum maritimum is the commonly cultivated sweet alyssum, a fragrant white-flowered annual.