The American Heritage® Dictionary of the English Language, 4th Edition
n. Any of various terrestrial annelid worms of the class Oligochaeta, especially those of the family Lumbricidae, that burrow into and help aerate and enrich soil.
n. A worm that lives in the ground; a worm of Lumbricidae family, or, more generally, of Lumbricina suborder.
n. this sense?) (derogatory) A person, particularly one who grovels.
n. Death.
the GNU version of the Collaborative International Dictionary of English
n. 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.
n. A mean, sordid person; a niggard.
The Century Dictionary and Cyclopedia
n. The common name of the worms of the family Lumbricidæ (which see), and especially of the genus Lumbricus, of which there are several species, one of the best-known being L. terrestris.
n. Figuratively, a mean, sordid wretch.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers
Word Usage
"I have selected an unfortunate earthworm from the backyard and will be giving it to the planarian soon."