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From The Collaborative International Dictionary of English v.0.48:
Gromwell \Grom"well\, n. [Called also gromel, grommel, graymill, and gray millet, all prob. fr. F. gr?mil, cf. W. cromandi.] (Bot.) A plant of the genus Lithospermum (L. arvense), anciently used, because of its stony pericarp, in the cure of gravel. The German gromwell is the Stellera. [Written also gromill.] [1913 Webster]