The ornamental design for a nipple for nursingbottle, as shown and described.
FIG. 1 is a perspective view of a nipple for nursing bottle of my new design;
FIG. 2 is a front elevation thereof;
FIG. 3 is a rear elevation thereof;
FIG. 4 is a right side elevation thereof;
FIG. 5 is a left side elevation thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
In the drawings, the evenly-spaced broken lines illustrate portions of the nipple for nursing bottle that form no part of the claimed design. In FIGS. 2-5 and 7, the dash-dot-dash lines indicate boundaries of the claimed design.