ARACHNOID Meaning and
Definition
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Arachnoid is an adjective that has multiple definitions depending on the context. In anatomy, it refers to a delicate, web-like membrane that forms the middle layer of the three meninges, which are the protective coverings of the brain and spinal cord. The arachnoid membrane lies between the dura mater and the pia mater, protecting and cushioning the central nervous system. It is named after its spider-web-like appearance, resembling the fine threads spun by spiders.
In zoology, the term arachnoid can also refer to certain characteristics of arachnids, a class of joint-legged invertebrate animals. Arachnids include spiders, scorpions, ticks, and mites, among others. These creatures typically possess two body segments, eight legs, and no antennae or wings. The arachnoid nature of these animals denotes their taxonomic classification as arachnids, which can be distinguished from insects and other related animal groups.
Outside of anatomical and zoological contexts, the term arachnoid is not widely used in everyday language. However, it is occasionally employed metaphorically to describe things that resemble or evoke the qualities of spiders or spider webs, such as delicate or intricate patterns, mazes, or labyrinths.
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Resembling a cobweb; noting specifically the arachnoidea, arachnoid membrane, or middle layer of membranes covering the brain and spinal cord.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
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In anat., a semi-transparent fine membrane spread over the brain and pia-mater, like a spider's web; in bot., composed of soft downy fibres.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
Common Misspellings for ARACHNOID
Etymology of ARACHNOID
The word "arachnoid" comes from the Greek word "arakhnē", meaning "spider". The suffix "-oid" in English is derived from the Greek suffix "-oeidēs", which means "resembling" or "form". Therefore, "arachnoid" literally means "resembling a spider". The term was first used in anatomy to describe one of the three membranes that surround the brain and spinal cord, characterized by its spider-web-like appearance.
Similar spelling words for ARACHNOID
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