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

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

Scorpiones :: Scorpiones (n. pl.) A division of arachnids comprising the scorpions.

Pulmonarian :: Pulmonarian (n.) Any arachnid that breathes by lunglike organs, as the spiders and scorpions. Also used adjectively..

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

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

Pedipalpus :: Pedipalpus (n.) One of the second pair of mouth organs of arachnids. In some they are leglike, but in others, as the scorpion, they terminate in a claw..

Spider :: Spider (n.) Any one of numerous species of arachnids comprising the order Araneina. Spiders have the mandibles converted into poison fangs, or falcers. The abdomen is large and not segmented, with two or three pairs of spinnerets near the end, by means of which they spin threads of silk to form cocoons, or nests, to protect their eggs and young. Many species spin also complex webs to entrap the insects upon which they prey. The eyes are usually eight in number (rarely six), and are situated on t

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..

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

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..

Trachea :: Trachea (n.) One of the respiratory tubes of insects and arachnids.

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

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

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

Mite :: Mite (n.) A minute arachnid, of the order Acarina, of which there are many species; as, the cheese mite, sugar mite, harvest mite, etc. See Acarina..

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

Arachnid :: Arachnid (n.) An arachnidan.

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..

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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