the GNU version of the Collaborative International Dictionary of English
n. See feldspar.
The Century Dictionary and Cyclopedia
n. Same as feldspar.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium
Word Usage
"From what has been said regarding the richness in potash of certain commonly occurring minerals, such as felspar, it is only natural to infer that most soils must contain large quantities of this substance; and this is so."