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Meaning of ARACHNOID

Pronunciation:  u'raknoyd

WordNet Dictionary
  1. [n]  air-breathing arthropods characterized by simple eyes and four pairs of legs
  2. [n]  the middle of the 3 meninges
  3. [adj]  (zoology) relating to or resembling a member of the class Arachnida

ARACHNOID is a 9 letter word that starts with A.


 Synonyms: arachnid, arachnidian, arachnoid membrane, spiderlike, spiderly, spidery
 See Also: acarine, Arachnida, arthropod, class Arachnida, daddy longlegs, false scorpion, harvestman, leptomeninges, meninges, meninx, Phalangium opilio, pseudoscorpion, scorpion, spider, whip scorpion, whipscorpion



Webster's 1913 Dictionary
  1. \A*rach"noid\, a. [Gr. ? like a cobweb; ? spider,
    spider's web + ? form.]
    1. Resembling a spider's web; cobweblike.
    2. (Anat.) Pertaining to a thin membrane of the brain and
       spinal cord, between the dura mater and pia mater.
    3. (Bot.) Covered with, or composed of, soft, loose hairs or
       fibers, so as to resemble a cobweb; cobwebby.
  2. \A*rach"noid\, n.
    1. (Anat.) The arachnoid membrane.
    2. (Zo["o]l.) One of the Arachnoidea.
Biology Dictionary
  1. Like a cobweb; covered with or consisting of soft fibers or hairs so entangled as to give a cobwebby appearance.
  2. The three membranes that cover the brain and spinal cord; going from skull to the brain, the membranes are the dura mater (the toughest of the three, a.k.a the pachymennix), the arachnoid (so called because it resembles a web) and the pia mater (delicate and highly vascular).