class Arachnida

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Definition
  1. Noun (Biology/Taxonomy):
    • A major taxonomic class within the phylum Arthropoda, comprising air-breathing invertebrates characterized by having four pairs of walking legs, a body divided into two main segments (the cephalothorax and the abdomen), and no antennae or wings. This class includes spiders, scorpions, ticks, mites, and harvestmen.
Usage Examples
  • Noun:
    • Spiders and scorpions both belong to the class Arachnida.
    • The study of the class Arachnida is called arachnology.
    • Ticks, which are parasites, are also members of class Arachnida.
Advanced Usage
  • "Arachnida" as a taxonomic rank: The term is used in formal scientific classification. It is often capitalized when referring to the formal class name: .
    • The order Araneae (spiders) falls under the class Arachnida.
Variants and Related Words
  • Arachnid (n): A common term for any member of the class Arachnida.
    • Spiders are the most familiar type of arachnid.
  • Arachnological (adj): Relating to the study of arachnids.
    • The arachnological society published new research.
  • Arachnology (n): The scientific study of spiders and related organisms in the class Arachnida.
    • She pursued a degree in arachnology.
Synonyms
  • Chelicerates (n): A broader subphylum (Chelicerata) that includes class Arachnida along with other classes like Merostomata (horseshoe crabs). While not a perfect synonym, it is a closely related taxonomic term.
    • Arachnids are a diverse group of chelicerates.
Notes on Different Meanings
  • The term "class Arachnida" has a single, specific meaning in scientific (zoological) context. It does not have common idiomatic or figurative uses outside of biology.
Noun
  1. 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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