noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A trigonal-rhombohedral mineral containing beryllium, oxygen, and silicon. countable, uncountable

Etymology

Ancient Greek φέναξ (phénax, a deceiver) (because of its resemblance to quartz). + -ite

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