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

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

Acarina :: Acarina (n. pl.) The group of Arachnida which includes the mites and ticks. Many species are parasitic, and cause diseases like the itch and mange..

Cephalothorax :: Cephalothorax (n.) The anterior portion of any one of the Arachnida and higher Crustacea, consisting of the united head and thorax..

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..

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

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

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..

Arthropoda :: Arthropoda (n. pl.) A large division of Articulata, embracing all those that have jointed legs. It includes Insects, Arachnida, Pychnogonida, and Crustacea..

Arachnid :: Arachnid (n.) An arachnidan.

Chela :: Chela (n.) The pincherlike claw of Crustacea and Arachnida.

Arachnology :: Arachnology (n.) The department of zoology which treats of spiders and other Arachnida.

Arachnidan :: Arachnidan (n.) One of the Arachnida.

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

Arctisca :: Arctisca (n. pl.) A group of Arachnida. 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..

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..

Trachearia :: Trachearia (n.pl.) A division of Arachnida including those that breathe only by means of tracheae. It includes the mites, ticks, false scorpions, and harvestmen..

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

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