mottle

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mottle

[′mäd·əl]
(medicine)
An effect that occurs during radiological imaging when the dose of radiation is reduced to a level where quantum effects can be observed.

mottle

1. The pattern or arrangement of spots and cloudings forming a mottled surface, esp. in marble, or in wood veneer as a result of unusual variation in fiber growth or fiber arrangement. Also see fiddleback, quilted figure, blister figure. 2.See mottling.