focometer: meaning, definition, pronunciation and examples
Very rare/obsolete technical termSpecialised technical (historical/optical physics)
Quick answer
What does “focometer” mean?
An optical instrument for measuring the focal length of a lens.
Audio
Pronunciation
Definition
Meaning and Definition
An optical instrument for measuring the focal length of a lens.
A device, primarily of historical use, employing optical principles to determine the precise distance from the optical centre of a lens to its principal focus.
Dialectal Variation
British vs American Usage
Differences
No significant difference; the term is equally rare and archaic in both varieties.
Connotations
Connotes 19th/early 20th century scientific practice, precision, and historical optics.
Frequency
Extremely low in both dialects, effectively obsolete outside historical reference.
Grammar
How to Use “focometer” in a Sentence
[Subject] used a focometer to [Verb] (e.g., 'He used a focometer to determine the lens power').The [Noun] (e.g., focal length) was measured with a focometer.[Subject] calibrated the focometer.Vocabulary
Collocations
Examples
Examples of “focometer” in a Sentence
adjective
British English
- The focometer readings were recorded.
American English
- The focometer measurements were precise.
Usage
Meaning in Context
Business
Not used.
Academic
Potentially found in historical papers on optics or the history of scientific instrumentation.
Everyday
Not used.
Technical
The only possible context, specifically in historical discussions of optical engineering or lens manufacturing.
Vocabulary
Synonyms of “focometer”
Strong
Neutral
Weak
Vocabulary
Antonyms of “focometer”
Watch out
Common Mistakes When Using “focometer”
- Spelling: 'focimeter' is an accepted variant; 'focometer' is less common.
- Confusing it with a 'photometer' or 'spectrometer'.
- Using it to refer to a modern auto-focus camera mechanism.
FAQ
Frequently Asked Questions
No, it is a very rare and largely obsolete technical term from historical optics.
A lensometer or vertometer, often digital, used by optometrists to measure eyeglass prescriptions.
It would be highly unusual and likely not understood unless speaking with a historian of science or optics.
They are variant spellings for the same type of instrument; 'focimeter' might be slightly more common in modern technical references.
An optical instrument for measuring the focal length of a lens.
Focometer is usually specialised technical (historical/optical physics) in register.
Focometer: in British English it is pronounced /fəʊˈkɒmɪtə/, and in American English it is pronounced /foʊˈkɑːmɪtɚ/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[None applicable for this highly technical term]”
Learning
Memory Aids
Mnemonic
Focus + meter = Focometer. It 'meters' (measures) the 'focus' point of a lens.
Conceptual Metaphor
TOOL FOR SEEING CLARITY (A device that quantifies the property which brings an image into sharp view).
Practice
Quiz
A focometer is primarily used to measure what property of a lens?