invertebrate

/in'və:tibrit/
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invertebrate

A worm is a common example of an invertebrate animal.

Definition

  1. Adjective:

    • Lacking a backbone or spinal column: Describes an animal that does not have a vertebral column (spine). This is the primary biological meaning.
    • (Figurative) Weak-willed or spineless: Describes a person who lacks strength of character, determination, or courage.

  2. Noun:

    • Any animal lacking a backbone: An animal that does not possess a vertebral column. This is a broad, non-scientific category encompassing the vast majority of animal species, such as insects, worms, mollusks, and crustaceans.
    • (Figurative) A weak or feeble person: A person who is perceived as lacking resolve, strength, or moral fiber.
Usage Examples

  • Adjective:

    • Jellyfish and starfish are classic examples of invertebrate marine life.
    • (Figurative) His invertebrate response to the criticism disappointed his supporters.

  • Noun:

    • Over 95% of all known animal species are invertebrates.
    • (Figurative) Don't be such an invertebrate; stand up for what you believe in.
Advanced Usage
  • Scientific vs. Colloquial Use: In formal biology, "invertebrate" is a descriptive term, not a formal taxonomic classification. Scientists typically refer to specific phyla (e.g., Arthropoda, Mollusca) rather than the collective "invertebrates."
  • "Invertebrate paleontology": A branch of paleontology that studies fossil invertebrates.
Variants and Related Words
  • Invertebrata : An obsolete taxonomic group name for all invertebrates.
  • Invertebral : Synonym for invertebrate, meaning "without vertebrae."
Synonyms
  • (Adjective, literal): spineless, boneless (in this specific context).
  • (Adjective/Noun, figurative): weak, feeble, indecisive, cowardly, milquetoast, pushover.
Antonyms
  • (Literal): vertebrate, chordate.
  • (Figurative): strong, resolute, courageous, determined, steadfast.
Related Phrases/Idioms
  • Invertebrate host: (Biology) A host organism that is an invertebrate, often used in parasitology.
    • The malaria parasite develops inside an invertebrate host, the mosquito.
invertebrate

A worm is a common example of an invertebrate animal.

Adjective
  1. lacking a backbone or spinal column
    • worms are an example of invertebrate animals
Noun
  1. any animal lacking a backbone or notochord; the term is not used as a scientific classification

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