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Octopoda :: Octopoda (n.pl.) Same as Arachnida.

Arachnoidea :: Arachnoidea (n. pl.) Same as Arachnida.

Arthrogastra :: Arthrogastra (n. pl.) A division of the Arachnida, having the abdomen annulated, including the scorpions, harvestmen, etc.; pedipalpi..

Arachnidium :: Arachnidium (n.) The glandular organ in which the material for the web of spiders is secreted.

Tardigrada :: Tardigrada (a.) An order of minute aquatic arachnids; -- called also bear animalcules, sloth animalcules, and water bears..

Tant :: Tant (n.) A small scarlet arachnid.

Palpus :: Palpus (n.) A feeler; especially, one of the jointed sense organs attached to the mouth organs of insects, arachnids, crustaceans, and annelids; as, the mandibular palpi, maxillary palpi, and labial palpi. The palpi of male spiders serve as sexual organs. Called also palp. See Illust. of Arthrogastra and Orthoptera..

Pedipalpi :: Pedipalpi (n pl.) A division of Arachnida, including the whip scorpions (Thelyphonus) and allied forms. Sometimes used in a wider sense to include also the true scorpions..

Arachnid :: Arachnid (n.) An arachnidan.

Spider :: Spider (n.) Any one of various other arachnids resembling the true spiders, especially certain mites, as the red spider (see under Red)..

Arachnida :: Arachnida (n. pl.) One of the classes of Arthropoda. See Illustration in Appendix.

Stigma :: Stigma (v. t.) One of the apertures of the pulmonary sacs of arachnids. See Illust. of Scorpion.

Arachnidial :: Arachnidial (a.) Of or pertaining to the Arachnida.

Linguatulina :: Linguatulina (n. pl.) An order of wormlike, degraded, parasitic arachnids. They have two pairs of retractile hooks, near the mouth. Called also Pentastomida..

Thorax :: Thorax (n.) The second, or middle, region of the body of a crustacean, arachnid, or other articulate animal. In the case of decapod Crustacea, some writers include under the term thorax only the three segments bearing the maxillipeds; others include also the five segments bearing the legs. See Illust. in Appendix..

Daddy Longlegs :: Daddy longlegs () An arachnidan of the genus Phalangium, and allied genera, having a small body and four pairs of long legs; -- called also harvestman, carter, and grandfather longlegs..

Araneina :: Araneina (n. pl.) The order of Arachnida that includes the spiders.

Tetraneumona :: Tetraneumona (n. pl.) A division of Arachnida including those spiders which have four lungs, or pulmonary sacs. It includes the bird spiders (Mygale) and the trapdoor spiders. See Mygale..

Chelicera :: Chelicera (n.) One of the anterior pair of mouth organs, terminated by a pincherlike claw, in scorpions and allied Arachnida. They are homologous with the falcers of spiders, and probably with the mandibles of insects..

Spiracle :: Spiracle (n.) One of the external openings communicating with the air tubes or tracheae of insects, myriapods, and arachnids. They are variable in number, and are usually situated on the sides of the thorax and abdomen, a pair to a segment. These openings are usually elliptical, and capable of being closed. See Illust. under Coleoptera..

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