Groundsel

n. [O. Eng. groundswell, A-S. grund-swilige, grund-swelige, senecio, i. e., a swelling of the ground, from swellan, swillan, to swell, because the ground swells every where with this plant, i. e., because it grows every where.] (Bot.) An annual plant of the genus Senecio, of several species, and now one of the most common and widely distributed weeds on the globe.