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any wingless, carnivorous arthropod of the class Arachnida, including spiders, scorpions, mites, ticks, and daddy-longlegs, having a body divided into two parts, the cephalothorax and the abdomen, and having eight appendages and no antennae.
Compare .
belonging or pertaining to the arachnids.
Contemporary Examples

The scorpion, a Heterometrus spinifer, is completely edible, despite the arachnid being deadly if alive.
Camel in a Can and 6 More Weird Canned Meats January 4, 2014

Historical Examples

His comparison of the arachnid appendages with those of insects and Crustacea is very curious.
Form and Function E. S. (Edward Stuart) Russell

It treats of curious animals which the author considers as more nearly allied to the Insecta than to the Crustacea or arachnid.
Anecdotes & Incidents of the Deaf and Dumb W. R. Roe

The arachnid are followed by the myriapoda (centipedes, etc.), and these by the insecti or true insects.
Scientific American Supplement, Vol. XV., No. 388, June 9, 1883 Various

The characteristics of the median eyes must then be especially sought for in the arachnid group.
The Origin of Vertebrates Walter Holbrook Gaskell

any terrestrial chelicerate arthropod of the class Arachnida, characterized by simple eyes and four pairs of legs. The group includes the spiders, scorpions, ticks, mites, and harvestmen

“a spider,” 1869, from French arachnide (1806) or Modern Latin Arachnida, introduced as name for this class of arthropods 1815 by French biologist Jean Baptiste Pierre Antoine de Monet de Lamarck (1744-1829), from Greek arakhne (fem.) “spider; spider’s web,” which probably is cognate with Latin aranea “spider, spider’s web” (borrowed in Old English as renge “spider”), from aracsna. The Latin word could be a Greek borrowing or both could be from a common root. An earlier noun form was arachnidian (1828).
Any of various arthropods of the class Arachnida, such as spiders, scorpions, mites, and ticks. Arthropods are characterized by four pairs of segmented legs and a body that is divided into two regions, the cephalothorax and the abdomen.


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  • Arachnoid

    resembling a spider’s web. of or belonging to the arachnids. Anatomy. of or relating to the arachnoid membrane. Botany. formed of or covered with long, delicate hairs or fibers. an arachnid. Anatomy. the serous membrane forming the middle of the three coverings of the brain and spinal cord. Historical Examples Meanwhile, we’re disgorging the arachnoid […]

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