noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Spectacles with corrective lenses that have three different powers per eye. plural, plural-only

Synonyms

All synonyms

bifocalscontact lenseyeglassglassglassesgoggles

Etymology

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

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.