from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A light yellow, red-brown, or black mineral, SnO2, that is an important tin ore. Also called tinstone.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A generally black mineral, composed of tin oxide, SnO2, which is an important ore of tin.
from the GNU version of the Collaborative International Dictionary of English
- n. Native tin dioxide; tin stone; a mineral occurring in tetragonal crystals of reddish brown color, and brilliant adamantine luster; also massive, sometimes in compact forms with concentric fibrous structure resembling wood (wood tin), also in rolled fragments or pebbly (Stream tin). It is the chief source of metallic tin. See black tin, under black.
from The Century Dictionary and Cyclopedia
- n. Native tin dioxid, SnO2, a mineral crystallizing in tetragonal forms, usually of a brown to black color, and having a splendent adamantine luster on the crystalline faces.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a hard heavy dark mineral that is the chief source of tin
French cassitérite, from Greek kassiteros, tin.(American Heritage® Dictionary of the English Language, Fourth Edition)