from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A hydraulic cement made by heating a limestone and clay mixture in a kiln and pulverizing the resulting material.
from The Century Dictionary.
from the GNU version of the Collaborative International Dictionary of English.
- A cement having the color of the Portland stone of England, made by calcining an artificial mixture of carbonate of lime and clay, or sometimes certain natural limestones or chalky clays. It contains a large proportion of clay, and hardens under water.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A finely-ground powder made by heating and pulverizing
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a cement that hardens under water; made by heating limestone and clay in a kiln and pulverizing the result
from The American Heritage® Dictionary of the English Language, 4th Edition
[After Portland, an urban district of southern England.]
from Wiktionary, Creative Commons Attribution/Share-Alike License
From its resemblance to limestone from Portland in Dorset
Sorry, no example sentences found.