Phrase guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
No pronunciation record was provided for this word.
noun
An optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source.
Definition source: English Wiktionary via Wiktextract
Topics: engineering, natural-sciences, optics, physical-sciences, physics
No example sentence was provided for this meaning.
Synonyms: blur circle, blur spot, circle of indistinctness, disc of confusion, disk of confusion
Antonyms: none provided
History
No etymology was provided for this word.
