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From The Collaborative International Dictionary of English v.0.48:
Groundsel \Ground"sel\, n. [OE. grundswilie, AS. grundeswylige, grundeswelge, earlier gundiswilge; gund matter, pus + swelgan to swallow. So named as being good for a running from the eye. See Swallow, v.] (Bot.) An annual composite plant (Senecio vulgaris), one of the most common and widely distributed weeds on the globe. Groundsel