Its principal constituents are sulphates of magnesia and soda.

Formic acid, at the concentration of 80%, is the principal constituent.

This was once the principal constituent of the paleoatmosphere, but is a minor component of the Earth's atmosphere today.

It is the principal constituent of woody fiber.

The other principal constituent is, as Kuiper found, methane.

Viticulture is a principal constituent of local culture.

Fay grapes are the principal constituent in Cask 23 wines.

The principal constituents thought to be responsible are hyperforin and amentoflavone.

The principal lunar semidiurnal constituent is known as M2 and generally has the largest amplitudes.

That is the principal constituent of natural gas here on Earth, an excellent fuel.