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 secondary lens mounted between the camera and a photographic lens so as to reduce the central part of an image obtained by the objective lens while concentrating the light rays on a smaller area.
Definition source: English Wiktionary via Wiktextract
Topics: arts, hobbies, lifestyle, photography
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
Something that boosts speed.
Definition source: English Wiktionary via Wiktextract
Usage: rare
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
From speed + booster.
