Spear hand

the hand in which a horseman holds a spear; the right hand.

See also: Spear

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
The spear hand flew to the limit of the throwing position to gather the force that would send the iron shod missile completely through the body of the unconscious victim.
Korak, momentarily forgetful of his bloody mission, permitted the fingers of his spear hand to relax a little their grasp upon the shaft of his formidable weapon.
His spear hand went far back the muscles rolled, lightning-like, beneath the sleek hide.