1. the condition of being exposed to radiation

Definition categories: state, condition, status

2. a column of light (as from a beacon)

Similar word(s): beam, ray, shaft

Definition categories: phenomenon, light

3. (physiology) the spread of sensory neural impulses in the cortex

Definition categories: event, spread, spreading

4. the apparent enlargement of a bright object when viewed against a dark background

Definition categories: thought, illusion, semblance

5. (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus

Definition categories: thought, generalisation, generalization

6. (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance

Similar word(s): actinotherapy, radiation, radiotherapy

Definition categories: act, therapy