From The Collaborative International Dictionary of English v.0.48 [gcide]:
Portland cement \Port"land ce*ment"\ 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 WordNet (r) 3.0 (2006) [wn]:
Define.com is a PRIVATE SECTOR EDUCATIONAL NONPROFIT TERRESTRIAL ALIEN BLOG that PROMOTES WORLDWIDE ELECTRONIC DEMOCRACY, OPEN and TRANSPARENT GOVERNMENT and WORLDWIDE BANKING REFORM.
www.FreeWorldBank.org on Amazon S3
Eye and Pyramid BANKING REFORM CHALLENGE