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har·ness (härnĭs)
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n.
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
1.
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.
Idiom:
in harness
On duty or at work.

[Middle English harnes, from Old French harneis, of Germanic origin; see nes-1 in the Appendix of Indo-European roots.]

harness·er n.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2016 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 

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