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Noun: stop number
  1. The ratio of the focal length to the diameter of a (camera) lens system
    - focal ratio, f number, speed

Derived forms: stop numbers

Type of: ratio

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stoolpigeon
stoop
stoop to
stooped
stooper
stooping
stop
stop bath
stop consonant
stop dead
stop number
stop order
stop over
stop payment
stop press
stop up
stop watch
stopcock
stope
Stopes
stopgap