Pronunciation: (troi'ku), [key]
1. a Russian carriage, wagon, or sleigh drawn by a team of three horses abreast.
2. a team of three horses driven abreast.
3. any group of three persons, nations, etc., acting equally in unison to exert influence, control, or the like.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.