right-hand

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of, relating to, or located on the right.
• adjective Relating to, designed for, or done with the right hand.
• adjective Most helpful or reliable.

from The Century Dictionary.

• Noting an engine in which the shaft that carries the fly-wheel is at the right hand of the observer as he stands at the head end of the cylinder looking toward the shaft: the reverse of left-hand. Also, one in which the observer, looking along the axis of the shaft from the crank end, finds the cylinder and its mechanism on his right.
• Belonging or adapted to the right hand.
• Situated on the right hand, or in a direction from the right side; leading to the right: as, a right-hand road.
• Serving as a right hand; hence, foremost in usefulness; of greatest service as an assistant.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Situated or being on the right; nearer the right hand than the left.
• adjective Chiefly relied on; almost indispensable.
• adjective a rope which is laid up and twisted with the sun, that is, in the same direction as plain-laid rope. See Illust. of Cordage.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective of, relating to, or located on the right
• adjective designed for use by the right hand

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective most helpful and reliable
• adjective located on or directed toward the right
• adjective intended for the right hand