arachnoid (redirected from arachnoid membranes)

a·rach·noid  (-rknoid)

adj.

1. Anatomy Of or relating to a delicate membrane enclosing the spinal cord and brain.

2. Of, relating to, or resembling arachnids.

3. Covered with or consisting of thin, soft, entangled hairs or fibers resembling those of a cobweb or spider's web.

n.

1. See arachnid.

2. Anatomy A delicate membrane that encloses the spinal cord and brain and lies between the pia mater and dura mater.

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[New Latin arachnods, from Greek arakhnoeids, cobweblike : arakhn, spider + -oeids, -oid.]

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arachnoid  (-rknoid)

The delicate membrane that encloses the spinal cord and brain and lies between the pia mater and dura mater.

Thesaurus

Noun	1.	arachnoid - the middle of the 3 meninges arachnoid membrane meninges, meninx - a membrane (one of 3) that envelops the brain and spinal cord leptomeninges - the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers
	2.	arachnoid - air-breathing arthropods characterized by simple eyes and four pairs of legs arachnid arthropod - invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin Arachnida, class Arachnida - a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings harvestman, Phalangium opilio, daddy longlegs - spiderlike arachnid with a small rounded body and very long thin legs scorpion - arachnid of warm dry regions having a long segmented tail ending in a venomous stinger false scorpion, pseudoscorpion - small nonvenomous arachnid resembling a tailless scorpion whip scorpion, whip-scorpion - nonvenomous arachnid that resembles a scorpion and that has a long thin tail without a stinger spider - predatory arachnid with eight legs, two poison fangs, two feelers, and usually two silk-spinning organs at the back end of the body; they spin silk to make cocoons for eggs or traps for prey acarine - mite or tick
Adj.	1.	arachnoid - relating to or resembling a member of the class Arachnida arachnidian, spiderlike, spiderly, spidery zoological science, zoology - the branch of biology that studies animals