Word Study
focal distance |
focal epilepsy |
focal infection |
focal length |
focal point |
focal ratio
| focal seizure
| focalisation
| focalise
| focalization
| focalize
focal ratio
WORDNET DICTIONARY
Noun focal ratio has 1 sense
- focal ratio(n = noun.linkdef) f number, speed, stop number - the ratio of the focal length to the diameter of a (camera) lens system; Array is a kind of ratio
For further exploring for "focal ratio" in Webster Dictionary Online
