[port.land cement] n [Isle of Portland, England; fr. its resemblance to a limestone found there] (1824): a hydraulic cement made by finely pulverizing the clinker produced by calcining to incipient fusion a mixture of clay and limestone or similar materials
PORTLAND CEMENT
Meaning of PORTLAND CEMENT in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012