from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A colorless, vitreous to resinous, often fluorescent mineral, Zn2SiO4, a minor ore of zinc.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A rare mineral, zinc silicate, Zn2SiO4, that is a minor ore of zinc.
from the GNU version of the Collaborative International Dictionary of English
- n. A silicate of zinc, usually occurring massive and of a greenish yellow color, also in reddish crystals (troostite) containing manganese.
from The Century Dictionary and Cyclopedia
- n. A mineral of resinous luster and yellowish-green or flesh-red color, a native silicate of zinc.
Dutch willemit, after Willem I (1772-1843), king of the Netherlands.(American Heritage® Dictionary of the English Language, Fourth Edition)
In honour of Willem I, king of the Netherlands (Wiktionary)