sectored disk

noun
sec·​tored disk | \ˈsektə(r)d-\
variants: or less commonly sector disk or sector wheel

Definition of sectored disk 

: a disk with alternate opaque and open sectors used in photometers to vary the brightness in a known manner

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Dictionary Entries near sectored disk

sectism

sectist

sector

sectored disk

sector gate

sector gear

sectorial

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