Earthworm \Earth"worm`\, n. 1. (Zo["o]l.) Any worm of the genus {Lumbricus} and allied genera, found in damp soil. One of the largest and most abundant species in Europe and America is {L. terrestris}; many others are known; -- called also {angleworm} and {dewworm}. 2. A mean, sordid person; a niggard. --Norris.