quaternary
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These include silver-based compounds, quaternary ammonium compounds—or QACs—and zinc-based chemicals.
From The Wall Street Journal ● Sep. 24, 2026
Sunway Healthcare operates its flagship quaternary hospital in Kuala Lumpur, the country’s capital.
From The Wall Street Journal ● Nov. 5, 2025
The researchers used cellular and organoid systems in the laboratory to show that quaternary ammonium compounds cause oligodendrocytes to die, while organophosphate flame retardants prevented the maturation of oligodendrocytes.
From Science Daily ● Mar. 25, 2024
The Salyerses’ unusual marriage is known as a quaternary marriage, and their sons are known as quaternary twins.
From Washington Post ● Aug. 24, 2022
In some books, too, you will find the tertiary and quaternary taken out and replaced by periods of different lengths called the Palaeogene and Neogene.
From "A Short History of Nearly Everything" by Bill Bryson
One authority fixes the neutrals as being black, gray and white; another regards them as those hues or tones which lack definite color, like quaternaries.
From Color Value by C. R. (Chandler Robbins) Clifford
It is easy to understand the composition of secondaries, but it is not so easy to know the tertiaries and quaternaries.
From Color Value by C. R. (Chandler Robbins) Clifford
The second circle is composed of the secondaries; the third circle, the tertiaries, and the outer circle, the quaternaries.
From Color Value by C. R. (Chandler Robbins) Clifford
In Diagram II we have arranged at opposite points the primaries 1, the secondaries 2, the tertiaries 3, the quaternaries 4.
From Color Value by C. R. (Chandler Robbins) Clifford
