/ Dictionary / Index P Portland cement: Meaning and Definition of Find definitions for: Port'land cement' Pronunciation: [key] a type of hydraulic cement usually made by burning a mixture of limestone and clay in a kiln. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Portland Port Lavaca Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language