Spectrum analysis of the black powder points unmistakably to the presence of an unknown element with a brilliant group of three lines in the green, and it is possible that it combines with argon to form a compound which acts at once with deadly effect upon some constituent in the blood.
There are no more uses of "constituent" in the book.
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My every meeting, movement, my every word, will be available to all my constituents and to the world.
Dave Eggers -- The Circle
He had been greeting friends and constituents for Eid at his hujra, just a mile from Imam Deri where Fazlullah’s headquarters had been, when the bomb went off.