Arachnoid
Encyclopedia
Arachnoid may refer to:
- Relating to arachnidArachnidArachnids are a class of joint-legged invertebrate animals in the subphylum Chelicerata. All arachnids have eight legs, although in some species the front pair may convert to a sensory function. The term is derived from the Greek words , meaning "spider".Almost all extant arachnids are terrestrial...
s - Arachnoid materArachnoid materThe arachnoid mater, literally from Latin "spider -like mother", is one of the three meninges, the membranes that cover the brain and spinal cord...
, a layer of the meninges, membranes that contain the central nervous system - Arachnoid (astrogeology)Arachnoid (astrogeology)In astrogeology, an arachnoid is a large structure of unknown origin, and they have been found only on the surface of the planet Venus. Arachnoids get their name from their resemblance to spider webs. They appear as concentric ovals surrounded by a complex network of fractures, and can span 200...
, a geological structure found only on the planet Venus