bifocals
English
Etymology
From bi- + focal (see focus), coined in 1824 by John Isaac Hawkins, inventor of trifocals. When the concept of bifocals was originally conceived by Benjamin Franklin, he called them double spectacles.
Noun
bifocals pl (plural only)
- spectacles that have corrective lenses of two different powers; used by people who need both distance and reading glasses
Translations
spectacles with two different powers
|
|
This article is issued from
Wiktionary.
The text is licensed under Creative
Commons - Attribution - Sharealike.
Additional terms may apply for the media files.