Definition

1. Noun:

   • A cold-blooded vertebrate animal: An animal of the class Amphibia that typically lives on land but breeds in water. These animals have an aquatic larval stage (like a tadpole) that undergoes metamorphosis into an adult form (like a frog).
   • An airplane designed for water: An aircraft that is built to take off from and land on water.
   • An all-terrain vehicle: A flat-bottomed motor vehicle capable of operating on both land and water.

2. Adjective:

   • Relating to amphibians: Pertaining to or characteristic of animals in the class Amphibia.
   • Operating on land and water: Describing a vehicle or craft capable of functioning in both environments.

Examples of Usage

• Noun (Animal):

  • Frogs, toads, and salamanders are all examples of an amphibian.
  • The life cycle of an amphibian involves a dramatic change from a water-breathing larva to an air-breathing adult.

• Noun (Aircraft/Vehicle):

  • The rescue team used an amphibian to reach the flooded area.
  • Vintage amphibians are popular with collectors of historical aircraft.

• Adjective:

  • The zoo has a new amphibian exhibit featuring species from around the world.
  • They developed an amphibian craft for exploring marshes and rivers.

Advanced Usage

• "Amphibian characteristics": Traits typical of amphibians, such as permeable skin and a complex life cycle.

  • The permeable skin is a key amphibian characteristic that allows for cutaneous respiration.

• In a figurative sense: Used to describe something or someone that operates or thrives in two different realms or environments.

  • As a diplomat and a poet, she led an almost amphibian existence between politics and art.

Variants and Related Words

• Amphibious (Adjective): This is the more common adjective form, especially for vehicles and military operations.

  • The Marines launched an amphibious assault.
  • The car was modified to be amphibious.

• Amphibia (Noun): The scientific class name for these animals.

  • The class Amphibia includes over 8,000 known species.

Synonyms

• For the animal: None are perfect synonyms, but related terms include "frog" (a type of amphibian), "salamander" (a type of amphibian).
• For the vehicle/aircraft: all-terrain vehicle (ATV) (for land/water vehicles), seaplane (for water aircraft).

Related Phrases (Phrasal Verbs)

Not commonly used with phrasal verbs.

Related Idioms

No common idioms directly feature the word "amphibian."

Adjective

1. relating to or characteristic of animals of the class Amphibia

Noun

1. cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form
2. an airplane designed to take off and land on water
3. a flat-bottomed motor vehicle that can travel on land or water