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
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No pronunciation record was provided for this word.
adj
Involving three foci.
Definition source: English Wiktionary via Wiktextract
Usage: not-comparable
Topics: engineering, natural-sciences, optics, physical-sciences, physics
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
adj
Of or pertaining to corrective lenses that have three different powers per eye.
Definition source: English Wiktionary via Wiktextract
Usage: not-comparable
Topics: engineering, natural-sciences, optics, physical-sciences, physics
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
By surface analysis, tri- + focal, or, by surface analysis, tri- + foc(us) + -al.
