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1. The gear or tackle, other than a yoke, with which a draft animal pulls a vehicle or implement.
2. Something resembling such gear or tackle, as the arrangement of straps used to hold a parachute to the body.
3. A device that raises and lowers the warp threads on a loom.
4. Archaic Armor for a man or horse.
tr.v. har·nessed, har·ness·ing, har·ness·es
a. To put a harness on (a draft animal).
b. To fasten by the use of a harness.
2. To bring under control and direct the force of: If you can harness your energy, you will accomplish a great deal.
in harness
On duty or at work.

[Middle English harnes, from Old French harneis, of Germanic origin; see nes- in Indo-European roots.]

har′ness·er n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.harnessed - brought under control and put to use; "electricity from the harnessed Colorado River"; "the harnessed power of the atom"
controlled - restrained or managed or kept within certain bounds; "controlled emotions"; "the controlled release of water from reservoirs"
References in classic literature ?
The cook's husband went into the house, which stood on an iron foundation and was iron-roofed, and soon returned saying that the little one was to be harnessed.
Thus, before the first hint of the coming of gray day, camp was broken, sled loaded, dogs harnessed, and the two men crouched waiting over the fire.
And many a powerful one who wanted to run well with the people, hath harnessed in front of his horses--a donkey, a famous wise man.