Word | Noun | Adjective | Verb | Adverb |
---|---|---|---|---|
British spelling | Yes | No | No | No |
dioptre | Yes | No | No | No |
British spelling (noun) | dioptre (noun) |
---|---|
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable') | a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists |