# phacolith

> English word · Noun

## Definitions
1. A lens-shaped mass that occurs in an anticlinal crest or synclinal trough.

## Etymology
Coined by English geologist Alfred Harker in 1909 as phacolite, from phaco- (“lens”) + -lite or -lith (“rock”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/phacolith