focometer

noun
fo·​com·​e·​ter | \ fō-ˈkäm-ət-ər How to pronounce focometer (audio) \
variants: also focimeter \ -​ˈsim-​ How to pronounce focimeter (audio) \

Medical Definition of focometer

: an instrument for measuring either the visual or the photographic focal length of an objective or of another optical system

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a period when something is suspended

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