trifocals

English

Etymology

From tri- + focal (see focus). Coined by John Isaac Hawkins, their inventor, in 1826.

Noun

trifocals pl (plural only)

1. (optics) Spectacles with corrective lenses that have three different powers per eye.

Related terms

• bifocals
• trifocal

Translations

type of spectacles

• Chinese:

  Mandarin: please add this translation if you can

• Finnish: kolmiteholasit
• French: please add this translation if you can