| NOUN | animal | class Arachnida, Arachnida | a large class of arthropods including spiders and ticks and scorpions and daddy longlegs |
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| Meaning | A large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings. | |
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| Synonym | Arachnida | |
| Member of | Chelicerata, superclass Chelicerata | spiders |
| Members | Acarina, order Acarina | mites and ticks |
| Araneae, order Araneae, Araneida, order Araneida | spiders | |
| Chelonethida, order Chelonethida, Pseudoscorpionida, order Pseudoscorpionida, Pseudoscorpiones, order Pseudoscorpiones | false scorpions | |
| Pedipalpi, order Pedipalpi, Uropygi, order Uropygi | whip scorpions | |
| Phalangida, order Phalangida, Opiliones, order Opiliones | harvestmen | |
| Scorpionida, order Scorpionida | true scorpions | |
| arachnid, arachnoid | air-breathing arthropods characterized by simple eyes and four pairs of legs | |
| Broader | class | (biology) a taxonomic group containing one or more orders |
| Spanish | arácnidos | |
| Catalan | Arachnida | |
| Adjectives | arachnoid, arachnidian | relating to or resembling a member of the class Arachnida |
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