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Webster 1913 Edition

Arachnoid

A-rach′noid

,
Adj.
[Gr. [GREEK] like a cobweb; [GREEK] spider, spider’s web +
εἶδοσ
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.

A-rach′noid

,
Noun.
1.
(Anat.)
The arachnoid membrane.
2.
(Zool.)
One of the Arachnoidea.

Webster 1828 Edition

Arachnoid

ARACH'NOID

,
Adj.
[Gr. a spider, and from; Heb. to weave, that is to stretch, to draw out; Eng. reach.]
In anatomy, the arachnoid tunic, or arachnoid, is a semitransparent thin membrane which is spread over the brain and piamater, and for the most part closely connected with the latter. The term has also been applied to that capsule of the crystalline lens, which is a continuation of the hyaloid membrane.

ARACH'NOID

,
Noun.
A species of madrepore found fossil.

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