noun

• 1rare Any of various Eurasian spiders belonging to Segestria and other genera, which inhabit cellars, caves, cracks in walls, underground holes, and other dark places.

• 2North American Any of various spiders of the genus Pholcus or (more widely) the cosmopolitan family Pholcidae, especially P. phalangioides, having long, thin legs and a small grey or brown body with darker markings, commonly inhabiting dark recesses and undisturbed areas, especially in buildings, where they construct irregular, tangled webs.