"Arachnoidea" is a word in ENGLISH

The group of Arachnida which includes the mites and ticks. Many species are parasitic, and cause diseases like the itch …

One of the classes of Arthropoda. See Illustration in Appendix.

One of the Arachnida.

Of or pertaining to the Arachnida.

The department of zoology which treats of spiders and other Arachnida.

The order of Arachnida that includes the spiders.

A group of Arachnida. See Illust. in Appendix.

A division of the Arachnida, having the abdomen annulated, including the scorpions, harvestmen, etc.; pedipalpi.

A large division of Articulata, embracing all those that have jointed legs. It includes Insects, Arachnida, Pychnogonida, and Crustacea.

The anterior portion of any one of the Arachnida and higher Crustacea, consisting of the united head and thorax.

The pincherlike claw of Crustacea and Arachnida.

One of the anterior pair of mouth organs, terminated by a pincherlike claw, in scorpions and allied Arachnida. They are …

Same as Arachnida.

A division of Arachnida, including the whip scorpions (Thelyphonus) and allied forms. Sometimes used in a wider sense to include …

A division of Arachnida including those spiders which have four lungs, or pulmonary sacs. It includes the bird spiders (Mygale) …

A division of Arachnida including those that breathe only by means of tracheae. It includes the mites, ticks, false scorpions, …