Portland cement

Definitions

1. Alternative letter-case form of Portland cement.
   alt-of, countable, uncountable
2. A finely-ground powder made by heating and pulverizing limestone and clay.
   countable, uncountable

Equivalents

Examples

“Ordinary Portland Cement (OPC) is the world's most common form⟳ of cement. The blue plaque dedicated to inventor Joseph Aspdin describes OPC as "one of mankind's most important manufactured materials".”

CEFR level