arachnid

/ə'ræknid/

Thân thiện

An arachnid, such as a spider, spins a delicate web between two branches.

Definition

1. Noun:
   • A class of air-breathing arthropods: An arachnid is an invertebrate animal characterized by having a body divided into two main segments (cephalothorax and abdomen), simple eyes (not compound), and four pairs of walking legs. This class includes spiders, scorpions, ticks, and mites.

Examples of Usage

• Noun:
  • Spiders and scorpions are both examples of an arachnid.
  • The biologist studied the anatomy of the tiny arachnid under the microscope.

Advanced Usage

• As a taxonomic term: In scientific classification, "Arachnida" is the class name, and "arachnid" refers to any member of this class.
  • The fossil record shows that this ancient arachnid had a slightly different body structure.

Variants and Related Words

• Arachnida (n): The scientific class name encompassing all arachnids.
• Arachnoid (adj): Resembling or related to a spider's web; also used in anatomy (e.g., arachnoid membrane).
• Arachnology (n): The scientific study of arachnids.

Synonyms

• Eight-legged arthropod: A descriptive synonym emphasizing the key physical trait.
• Chelicerate: A broader term referring to the subphylum Chelicerata, which includes arachnids, horseshoe crabs, and sea spiders.

Related Phrases

• Arachnid venom: Refers to the toxin produced by some arachnids like spiders and scorpions.
• Arachnid fear (Arachnophobia): An intense fear of spiders and other arachnids. (Note: "Arachnophobia" is the specific term for the phobia).

Học thuật

Noun

1. air-breathing arthropods characterized by simple eyes and four pairs of legs

Từ đồng nghĩa

• arachnoid