from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various altered basic igneous rocks colored green by chlorite, hornblende, or epidote.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. any of several green-hued minerals used for making various artefacts in early Mesoamerican cultures, e.g. greenschist, chlorastrolite, serpentine, omphacite, or chrysoprase
- n. the green-hued minerals of New Zealand used by Māori to make tools, ornaments and weapons (any of three varieties of nephrite jade or one variety of bowenite)
from the GNU version of the Collaborative International Dictionary of English
- n. A name formerly applied rather loosely to certain dark-colored igneous rocks, including diorite, diabase, etc.
from The Century Dictionary and Cyclopedia
- n. Any one of various rocks, of eruptive origin, in general older than the Tertiary, crystalline-granular in texture, and of a dark-greenish color.
- n. A very hard and close-textured stone used for putting the last edge on lancets and other delicate surgical instruments, etc.
- n. A name in New Zealand for several varieties of jade, specifically for pounamu or nephrite, found chiefly on the west coast of the Middle Island: formerly much used by the Maoris for weapons, implements, and ornaments.
From green + stone. (Wiktionary)