Basic Guidelines For English Spellings
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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.
Mid 18th century; earliest use found in The Universal Magazine. From cellar + spider.