gnomon: meaning, definition, pronunciation and examples
C2Formal/Technical
Quick answer
What does “gnomon” mean?
The part of a sundial that casts the shadow, used to indicate the time by the Sun.
Audio
Pronunciation
Definition
Meaning and Definition
The part of a sundial that casts the shadow, used to indicate the time by the Sun.
Any object or part used similarly for projecting a shadow or indicating a direction; in geometry, a figure remaining after a smaller similar figure has been taken from a corner of a larger one.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. The word is identically specialised in both variants.
Connotations
Evokes classical antiquity, precision, and scientific observation.
Frequency
Extremely low frequency in both varieties, slightly more likely to appear in British academic or historical texts due to the prevalence of antique sundials in UK gardens and architecture.
Grammar
How to Use “gnomon” in a Sentence
The [material] gnomon on the [type] sundial [verb].A gnomon cast a sharp shadow.Vocabulary
Collocations
Examples
Examples of “gnomon” in a Sentence
verb
British English
- The instrument was designed to gnomon the solar altitude.
- He tried to gnomon the precise moment of noon.
American English
- The device gnomons the sun's position accurately.
- Ancient astronomers would gnomon the hours.
adverb
British English
- The shadow fell gnomonically across the pavement.
- It was aligned gnomon-wise to true north.
American English
- The device pointed gnomonically south.
- The scale was laid out gnomon-fashion.
adjective
British English
- The gnomon shadow was clearly marked.
- They studied the gnomon projection.
American English
- The gnomon line indicated noon.
- We took gnomon readings all day.
Usage
Meaning in Context
Business
Virtually never used.
Academic
Used in history of science, archaeology, astronomy, and geometry papers.
Everyday
Extremely rare, except when specifically discussing sundials.
Technical
Precise term in horology (study of timekeeping), astronomy, and geometry.
Watch out
Common Mistakes When Using “gnomon”
- Mispronouncing the initial 'g' (it is silent).
- Misspelling as 'gnoman' or 'nommon'.
- Using it as a general term for any pointer.
FAQ
Frequently Asked Questions
No, the 'g' is silent in both British and American English. It is pronounced 'NOH-mon'.
Yes, in geometry, it is the name for the shape left when a smaller similar parallelogram is removed from the corner of a larger one.
No, it is a very low-frequency, specialised term. Most learners will only encounter it in specific historical or technical contexts.
It comes from ancient Greek 'gnōmōn', meaning 'indicator' or 'one who knows', related to 'gnosis' (knowledge).
The part of a sundial that casts the shadow, used to indicate the time by the Sun.
Gnomon is usually formal/technical in register.
Phrases
Idioms & Phrases
- “Like a faulty gnomon (meaning: giving misleading or inaccurate information).”
Learning
Memory Aids
Mnemonic
Think 'GNOME ON' a sundial. A garden gnome standing on the dial acts as the gnomon, casting a shadow.
Conceptual Metaphor
A FIXED POINT OF REFERENCE (e.g., 'His moral principles were the gnomon by which he measured all actions.').
Practice
Quiz
In which field is the term 'gnomon' used in a specific geometric sense?