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A Writer's Dictionary:

trifocal Definition


Dictionary Home » Words Starting with T » trichology ... trigonal » trifocal


trifocal
adj
    1. Said of a lens: having three different focal lengths.
    2. Said of a pair of spectacles: having lenses of this kind.
noun
    1. Spectacles that have lenses of this kind.
      Form: trifocals
Etymology: 19c.



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