Standard Lemma 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
A device which allows one to adjust the focus of an instrument such as a telescope.
Definition source: English Wiktionary via Wiktextract
Synonyms: none provided
Antonyms: none provided
History
From focus + -er.
