| 释义 |
fo·com·e·ter
\fōˈkäməd.ə(r)\ noun
also fo·cim·e·ter \-ˈsim-\
Etymology: French focomètre, focimètre, from foco-, foci- (from New Latin focus) + -mètre -meter
: an instrument for measuring either the visual or the photographic focal length of an objective or of another optical system |