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Answer for the clue "The Horsemen of the Apocalypse, e.g ", 6 letters:
tetrad

Alternative clues for the word tetrad

Word definitions for tetrad in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Tetrad \Tet"rad\, n. [L. tetras, -adis, Gr. ?, ?: cf. F. t['e]trade.] The number four; a collection of four things; a quaternion. (Chem.) A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad.

Usage examples of tetrad.

It might be suggested that a dyad is that thing--or rather what is observed upon that thing--which has two powers combined, a compound thing related to a unity: or numbers might be what the Pythagoreans seem to hold them in their symbolic system in which Justice, for example, is a Tetrad: but this is rather to add the number, a number of manifold unity like the decad, to the multiplicity of the thing which yet is one thing.

Loguisse nodded, then warned Shareem that they had better deal with Kell soon, since he was making considerable progress among the Stayers, turning them against Aleytys, and his converts were trying to pressure the Tetrad to revoke her acceptance.

But since qinks only flew the mating dance in tetrads, two of them were always keeping an eye on the sky ahead at all times.

So, in a cycle or two, the zotl would be back in the tetrad vector field and more aggressive than ever.