SG Heritage Dictionary

Arachnoid [Adjective] Webster's Dictionary 1828

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.

Arachnoid [Noun] Webster's Dictionary 1828

A species of madrepore found fossil.

Arachnoid [Adjective] Webster's Dictionary 1913

1. Resembling a spider's web; cobweblike.

2. Pertaining to a thin membrane of the brain and spinal cord, between the dura mater and pia mater.

3. Covered with, or composed of, soft, loose hairs or fibers, so as to resemble a cobweb; cobwebby.

Arachnoid [Noun] Webster's Dictionary 1913

1. The arachnoid membrane.

2. One of the Arachnoidea.

Arachnoidal [Adjective] Webster's Dictionary 1913

Pertaining to the arachnoid membrane; arachnoid.

Arachnoidea [Noun plural] Webster's Dictionary 1913

Same as Arachnida.