wanderer

An American lycænid butterfly, Feniseca tarquinius, wide-spread in the United States east of Kansas. Its larvæ feed upon plant-lice on alder.

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.

plural In Arachnida, specifically, the wandering as distinguished from the sedentary spiders; the vagabonds. See Vagabundæ.

One who wanders; a rambler; one who roves; hence, one who deviates from duty.

One who wanders, who travels aimlessly.

someone who leads a wandering unsettled life

a computer program that prowls the internet looking for publicly accessible resources that can be added to a database; the database can then be searched with a search engine