Brocked is a slang term, reportedly originating from the Royal New Zealand Airforce, that refers to the act of another aircrew member secretly and sneakily taking away ones allocated flying time or duty.
Dioptrics
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The science of the refraction of light; that part ofgeometrical optics which treats of the laws of the refraction oflight in passing from one medium into another, or through differentmediums, as air, water, or glass, and esp. through different lenses;-- distinguished from catoptrics, which refers to reflected light.
Dioptrics meaning & definition 1 of Dioptrics.
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