7 letters · 8 points in Scrabble
noun a granular crystalline intrusive rock
originFrom French diorite, invented by mineralogist Alexandre Brongniart (1770-1847), derived from Ancient Greek διορίζω (diorízō, “distinguish”), from δι- plus ὁρίζω (horízō, “to limit”).
Etymology from Wiktionary, CC BY-SA 3.0