1. A strong hard building material composed of sand, gravel, cement, and water; all of which have "grown together" to make a solid mass.
2. A hard, strong construction material consisting of sand, conglomerate gravel, pebbles, broken stone, or slag in a mortar or cement matrix formed by the coalescence of those separate particles or parts into one mass; a solid.
3. A mixture of cement, sand, aggregate, and water in specific proportions which hardens into a strong stony consistency over varying lengths of time.
"Each year billions of tons of concrete become the stuff of buildings, highways, dams, sidewalks, and even artwork. The Romans invented cement-based concrete and used the material to build the Pantheon."
—Hugh Clay Paulk, "All Mixed Up", www.hughclaypaulk.com
The crescent moon is so called because it is increasing in size from night to night. The word is used with reference to the moon only in its first quarter, and is applied to anything of similar shape.
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