Definition

1. Noun:
   • (Medicine): The treatment of disease, especially cancer, by exposure to a radioactive substance or other form of radiation.
   • (Psychology/Pavlovian conditioning): The elicitation of a conditioned response by a stimulus that is similar but not identical to the original conditioned stimulus.
   • (Optics): The apparent enlargement of a bright object when viewed against a dark background.
   • (Physiology): The spread of sensory neural impulses in the cortex of the brain.
   • (General): A column of light, as from a beacon or lamp.
   • (General): The condition or state of being exposed to radiation.

Usage Examples

• Noun (Medical):
  • The patient underwent irradiation to target the tumor.
• Noun (Psychology):
  • The phenomenon of irradiation explains why a dog might salivate to a bell of a slightly different pitch.
• Noun (Optics):
  • The star's irradiation makes it look larger in the night sky.
• Noun (Physiology):
  • Irradiation of the neural signal across the cortex helps integrate sensory information.
• Noun (Light):
  • A powerful irradiation from the lighthouse pierced the fog.
• Noun (Exposure):
  • Prolonged irradiation can be hazardous to health.

Advanced Usage

• "Food irradiation": The process of exposing food to ionizing radiation to eliminate pathogens and extend shelf life.
  • Food irradiation is a controversial but effective preservation technique.
• "Cortical irradiation": Refers specifically to the spread of neural activity in the cerebral cortex.
  • The study focused on the patterns of cortical irradiation following a stimulus.

Variants and Related Words

• Irradiate (verb): To expose to or treat with radiation; to illuminate.
  • The machine is used to irradiate the samples.
• Irradiated (adjective): Having been exposed to radiation.
  • Irradiated mail is screened for safety.
• Irradiance (noun): The flux of radiant energy per unit area (a related but distinct term in physics).
  • Solar irradiance is measured in watts per square meter.

Synonyms

• Radiation therapy (for the medical sense).
• Generalization (in psychology, a closely related concept).
• Diffusion (for the spread of light or neural activity).
• Illumination (for the light column sense).
• Exposure (for the condition sense).

Related Phrases

• "Undergo irradiation": To receive radiation treatment.
  • The patient had to undergo irradiation for six weeks.
• "Source of irradiation": The origin or emitter of radiation.
  • The X-ray tube is the source of irradiation in this procedure.

Related Idioms

Noun

1. (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
2. (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus
3. the apparent enlargement of a bright object when viewed against a dark background
4. (physiology) the spread of sensory neural impulses in the cortex
5. a column of light (as from a beacon)
6. the condition of being exposed to radiation