n. An American lycænid butterfly, Feniseca tarquinius, wide-spread in the United States east of Kansas. Its larvæ feed upon plant-lice on alder.n. One who or that which wanders; one who roams about, having no home or certain place of abode; also, one who strays from the path of duty.n. plural In Arachnida, specifically, the wandering as distinguished from the sedentary spiders; the vagabonds. See Vagabundæ.