noun.
A narrow railing that is grasped with the hand for support, as on a staircase.
The Century Dictionary and Cyclopedia
noun.
A rail or railing resting on balusters or uprights, or otherwise supported and fixed, serving as a guard and support on the edge of a stair, a gallery, a platform, etc.; a rail to hold by.
the GNU version of the Collaborative International Dictionary of English
noun.
a rail{1} at the side of staircase or balcony to prevent people from falling; -- shaped so as to be conveniently gripped with the hand.