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The arachnoid membrane.

Pertaining to the arachnoid membrane; arachnoid.

Same as Arachnida.

Situated under the arachnoid membrane.

Inflammation of the arachnoid membrane.

Of the aspect of a spider's web; arachnoid.

ke; extremely thin and delicate, like a cobweb; as, the araneous membrane of the eye. See Arachnoid. Derham.

A suborder of Arachnoidea, including the European tarantula and the wolf spiders (Lycosidae) and their allies, which capture their prey by rapidly running and jumping. See Wolf spider.

In the most general sense, the Hexapoda, Myriapoda, and Arachnoidea, combined.

Inflammation of the pia mater or of the arachnoid membrane.

he three membranes that envelop the brain and spinal cord; the pia mater, dura mater, and arachnoid membrane.

A division of Arachnoidea, including the daddy longlegs or harvestman (Phalangium) and many similar kinds. They have long, slender, many-jointed legs; usually a rounded, segmented abdomen; and chelate jaws. They breathe by tracheæ. Called also Phalangides, Phalangidea, Phalangiida, and Opilionea.

An order of Arachnoidea having the palpi terminated by large claws, as in the scorpions, but destitute of a caudal sting; the false scorpions. Called also Pseudoscorpii, and Pseudoscorpionina. See Illust. of Book scorpion, under Book.

The roots of the Chilian plant Calceolaria arachnoidea, -- used for dyeing crimson.

Situated under the dura mater, or between the dura mater and the arachnoid membrane.