from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A dark green to brown or black mineral, ZnAl2O4. Also called zinc spinel.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A rare mineral ZnAl2O4 in the spinel group.
from the GNU version of the Collaborative International Dictionary of English
- n. Zinc spinel; automolite.
from The Century Dictionary and Cyclopedia
- n. A mineral of the spinel group, crystallizing in the isometric system, commonly in regular octahedrons.
After Johan Gottlieb Gahn (1745-1818), Swedish mineralogist.(American Heritage® Dictionary of the English Language, Fourth Edition)
Named after Swedish chemist Johan Gottlieb Gahn (1745-1818) in 1807. (Wiktionary)