Definition of Arachnida

1. Noun. A large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings.

Definition of Arachnida

1. n. pl. One of the classes of Arthropoda. See Illustration in Appendix.

Medical Definition of Arachnida

1. One of the classes of Arthropoda. They have four pairs of legs, no antennae nor wings, a pair of mandibles, and one pair of maxillae or palpi. The head is usually consolidated with the thorax. The respiration is either by trancheae or by pulmonary sacs, or by both. The class includes three principal orders: Araneina, or spiders; Arthrogastra, including scorpions, etc.; and Acarina, or mites and ticks. Origin: NL, fr. Gr. Spider. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Arachnida

arachidonic acid 18-hydroxylase
arachidonic acid cascade
arachidonoyl coenzyme A lysophosphatide acyltransferase
arachidonoylethanolamide synthase
arachidonyl transacylase
arachis oil
arachnid vectors
arachnida (current term)
arachnogenic necrosis

Literary usage of Arachnida

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Spider Book: A Manual for the Study of the Spiders and Their Near by John Henry Comstock (1912)
"We can say, therefore, that in the arachnida the first pair of antennae are ... Most arachnida differ from all other air-breathing arthropods in having the ..."

2. Philosophical Transactions of the Royal Society of London by Royal Society (Great Britain) (1843)
"Secondly, to demonstrate the existence of a complete system of circulatory vessels in the Myriapoda and arachnida. Thirdly, to show the identity of the laws ..."

3. Text-book of the Embryology of Invertebrates by Eugen Korschelt, Karl Heider, Edward Laurens Mark, William McMichael Woodworth, Matilda Bernard, Martin Fountain Woodward (1899)
"The fusion of segments which often takes place among the arachnida is of ... The arachnida have only two pairs of cephalic limbs (the chelicerae and the ..."

4. International Catalogue of Scientific Literature by Royal Society (Great Britain) (1906)
"arachnida of the expedition. [Reprinted from Washington, DC, Proc. Acad. ... The arachnida of Florida. California. 6. Some arachnida from1 /' CENTRAL AND ..."

5. On Animal and Vegetable Parasites of the Human Body: A Manual of Their by Friedrich Küchenmeister (1857)
"They are wanting in the arachnida and Insects. /. In the higher species, ... In detail the arachnida consist of the following parts: 1. ..."

6. Natural History: A Manual of Zoölogy for Schools, Colleges, and the General by Sanborn Tenney (1869)
"THE ORDER OF arachnida, OR SPIDERS. THIS Order embraces insects which have the ... The Tracheary arachnida perform their respiration by means of tracheae, ..."

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