from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mineral composed of oxides of various rare earth elements.
from the GNU version of the Collaborative International Dictionary of English
- n. A mineral of a brownish black color, essentially a tantalo-niobate of yttrium, erbium, and cerium; -- so called after Robert Ferguson.
from The Century Dictionary and Cyclopedia
- n. A brownishblack mineral consisting mainly of niobic acid and yttria, and crystallizing in the tetragonal system.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals
Ferguson + -ite (Wiktionary)