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irradiation

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

irradiation \ir*ra'di*a"tion\ ([i^]r*r[=a]'d[i^]*[=a]"sh[u^]n), n. [Cf. F. irradiation.]

1. Act of irradiating, or state of being irradiated; as, irradiation of foods with X-rays can preserve their freshness by killing the bacteria that cause spoilage . [1913 Webster +PJC]

2. Illumination; irradiance; brilliancy. --Sir W. Scott.

3. Fig.: Mental light or illumination. --Sir M. Hale.

4. (Opt.) The apparent enlargement of a bright object seen upon a dark ground, due to the fact that the portions of the retina around the image are stimulated by the intense light; as when a dark spot on a white ground appears smaller, or a white spot on a dark ground larger, than it really is, esp. when a little out of focus.

From WordNet (r) 3.0 (2006) [wn]:

irradiation

noun

1: the condition of being exposed to radiation

2: a column of light (as from a beacon) [syn: {beam}, {beam of light}, {light beam}, {ray}, {ray of light}, {shaft}, {shaft of light}, {irradiation}]

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

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

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

6: (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance [syn: {radiotherapy}, {radiation therapy}, {radiation}, {actinotherapy}, {irradiation}]


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