noun ·3 syllables ·Rare ·Advanced level

Definitions

Noun

1. 1
   A variety of plagioclase feldspar, the calcium endmember of that series. countable, uncountable
2. 2
   rare plagioclastic feldspar occurring in many igneous rocks wordnet

Etymology

From Ancient Greek αν- (an-, “not”) + ὀρθός (orthós, “straight”) "not perpendicular; less than straight", in reference to its odd.

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