sectored disk

1 of 2

noun (1)

sec·​tored disk

ˈsektə(r)d-

variants or less commonly sector disk or sector wheel

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

sector gear

2 of 2

noun (2)

1

or sector wheel : a toothed device resembling a portion of a gear wheel containing the center bearing and a part of the rim with its teeth

2

: a gear having a sector gear as its chief essential feature

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