(From Aranea 1133 , to knit together,) called also arachne araneus, the catcher, the wolf, and Spider.

Spiders are absurdly said to abound with volatile salt, in consequence of which they are sometimes useful in agues, if taken inwardly. A scruple of the spider's web, it has been said, in many instances hath proved successful, given an hour before the fit of an ague, and an hour after it. They may perhaps contain an acrid oil, but their effect in agues is from the horror excited: they never cured, when the nature of the medicine was concealed. By this name are also called the coat and capsula of the crystalline humour of the eyes, named also speculum crystalloides tunica. It is furnished with vessels from the ciliary processes, and from an artery which enters the bottom of the retina and runs through the vitreous humour.

Aranea is also the appellation of die coat of the vitreous humour of the eye, from resembling a spider's web; called also arachnoides, a name added to it by Herophilus, according to Celsus. It is now called vi-trea tunica. Dr. Nicholls, and Albinus, on injecting it, say that the vessels run on it like rays from a centre.