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WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
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WORDNET DICTIONARY
Noun portland cement has 1 sense
- portland cement(n = noun.substance) hydraulic cement - a cement that hardens under water; made by heating limestone and clay in a kiln and pulverizing the result; is a kind of cement
CIDE DICTIONARY
portland cement,
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. [1913 Webster]
OXFORD DICTIONARY
portland cement, n. a cement manufactured from chalk and clay which when hard resembles Portland stone in colour.