a dark-gray, intrusive igneous rock consisting chiefly of plagioclase and hornblende
Origin of dioriteFrench from Classical Greek diorizein, to divide from dia-, through + horizein, to separate: see horizon
Any of various dark, granite-textured, crystalline rocks rich in plagioclase feldspar and having little quartz.
Origin of dioriteFrench from Greek diorizein to distinguish dia- apart, between ; see dia- . horizein to divide, limit ; see horizon .