Usually means: Lens with three focal lengths.
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We found 13 dictionaries that define the word trifocal:

General (10 matching dictionaries)
  1. trifocal: Merriam-Webster
  2. trifocal: Oxford Learner's Dictionaries
  3. trifocal: American Heritage Dictionary of the English Language
  4. trifocal: Collins English Dictionary
  5. trifocal: Wiktionary
  6. trifocal: Webster's New World College Dictionary, 4th Ed.
  7. trifocal: The Wordsmyth English Dictionary-Thesaurus
  8. trifocal: Infoplease Dictionary
  9. trifocal: Dictionary.com
  10. trifocal: TheFreeDictionary.com

Medicine (3 matching dictionaries)
  1. trifocal: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. trifocal: Medical dictionary

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Definitions from Wiktionary (trifocal)

▸ adjective:  (optics) Of or pertaining to corrective lenses that have three different powers per eye.

Similar:
quadrifocal, bifocal, multifocal, triocular, bifocus, tri-focused, trifactorial, dioptrical, trichromic, trifaceted, more...

Opposite:
bifocal, monofocal, single-vision

Types:
bifocal, progressive, more...

Phrases:
trifocal lens, trifocal glasses, Trifocal tensor, more...

▸ Words similar to trifocal

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Similar:
quadrifocal, bifocal, multifocal, triocular, bifocus, tri-focused, trifactorial, dioptrical, trichromic, trifaceted, more...

Opposite:
bifocal, monofocal, single-vision

Types:
bifocal, progressive, more...

Phrases:
trifocal lens, trifocal glasses, Trifocal tensor, more...



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