from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A white to dark green variety of jade, chiefly a metasilicate of iron, calcium, and magnesium.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A semi-precious stone, one of the two types of stone commonly referred to as jade, (the other being jadeite).
from the GNU version of the Collaborative International Dictionary of English
- n. A hard compact mineral, of a dark green color, formerly worn as a remedy for diseases of the kidneys, whence its name; kidney stone; a kind of jade. It varies in color from white to dark green. It is the more common and less valuable variety of jade, the other being jadeite. Large deposits are found in Australia. Called also nephritic stone. See also jade.
from The Century Dictionary and Cyclopedia
- n. A tough compact variety of amphibole (tremolite or actinolite), of a leek-green color, often found in rolled pieces: jade. It was formerly worn as a remedy for diseases of the kidneys. See jade.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an amphibole mineral consisting of calcium magnesium silicate in monoclinic crystalline form; a source of jade that is less valuable than from jadeite; once believed to cure kidney disorders
Greek nephros, kidney (from the belief that it cured kidney diseases) + -ite1.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin lapis nephriticus, via Ancient Greek λίθος νεφριτικός, meaning kidney stone, because jade was believed to have cured kidney stones. (Wiktionary)