FIG. 1 is a right side elevational view of a medical chair including the chair armrest;

FIG. 2 is a front view of the chair armrest;

FIG. 3 is a top view of the chair armrest;

FIG. 4 is a rear view of the chair armrest;

FIG. 5 is a bottom view of the chair armrest; and,

FIG. 6 is a left side elevational view of the chair armrest.

The broken lines showing portions of the chair in FIG. 1 are for illustrative purposes only and form no part of the claimed design.