Definition

1. Noun:
   • (Anatomy) A natural hollow or sinus within the body: A cavity is an empty space or hollow area that exists naturally within a living organism.
   • A soft decayed area in a tooth; progressive decay can lead to the death of a tooth: In dentistry, a cavity is a hole or area of damage in a tooth caused by decay.
   • Space that is surrounded by something: A cavity is any enclosed or partially enclosed empty space within a larger structure or object.
   • A sizeable hole (usually in the ground): A cavity can refer to a large, hollowed-out area in the earth.

Examples of Usage

• Anatomical Hollow:
  • The heart is located within the thoracic cavity.
  • A sinus infection affects the cavities in the skull.
• Dental Decay:
  • The dentist found a small cavity during my check-up.
  • Eating too much sugar can cause cavities.
• Enclosed Space:
  • The machine part had a cavity for the wiring.
  • Insulation was placed in the wall cavity.
• Hole in the Ground:
  • Water collected in a cavity in the rock.
  • The archaeologists discovered a burial cavity.

Advanced Usage

• "Resonant cavity": In physics, a cavity designed to resonate at specific frequencies, often used in lasers or musical instruments.
  • The laser's light is amplified within the optical resonant cavity.
• "Body cavity": A specific term in anatomy and medicine for any fluid-filled space.
  • During surgery, the doctor examined the abdominal cavity.

Variants and Related Words

• Cavitation (n): The formation of cavities in a structure or liquid, often due to pressure changes.
  • Cavitation can damage a ship's propeller.
• Cavitate (v): To form cavities.
  • The rapid pressure change caused the fluid to cavitate.
• Alveolar (adj): Relating to the small cavities (alveoli) in the lungs or jaw.
  • Alveolar sacs are crucial for gas exchange.

Synonyms

• Hollow: An empty space within a solid object.
• Chamber: An enclosed space, often within a building or machine.
• Pit: A large hole in the ground.
• Caries: The technical term for tooth decay or a dental cavity.

Related Phrases

• Oral cavity: The medical term for the mouth.
  • The infection started in the oral cavity.
• Cranial cavity: The space inside the skull that contains the brain.
  • The brain is protected within the cranial cavity.
• Chest cavity: Another term for the thoracic cavity.
  • An X-ray showed his lungs within the chest cavity.

Idioms

• To have a cavity: A common phrase meaning to have a decayed spot in a tooth.
  • I need to see the dentist because I think I have a cavity.
• Like a cavity in a tooth: An informal simile for something that is a persistent, nagging problem.
  • That unresolved issue is like a cavity in a tooth—it just keeps getting worse if you ignore it.

Noun

1. (anatomy) a natural hollow or sinus within the body
2. soft decayed area in a tooth; progressive decay can lead to the death of a tooth
3. space that is surrounded by something
4. a sizeable hole (usually in the ground)
   • they dug a pit to bury the body