n. (Chem.) A high explosive consisting principally of picric acid, used as a shell explosive in the British service; -- so named from the proving grounds at Lydd, England. [ Webster 1913 Suppl. ]

n. One of a number of riotous persons in England, who for six years (1811-17) tried to prevent the use of labor-saving machinery by breaking it, burning factories, etc.; -- so called from Ned Lud, a half-witted man who some years previously had broken stocking frames. J. & H. Smith. H. Martineau. [ 1913 Webster ]