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.

• 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.
• 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.

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