The ornamental design for a ceilingfan, as shown and described.
FIG. 1 is a top perspective view of a ceiling fan, showing my new design.
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a left view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
Portions of the ceiling fan are shown in broken lines, which form no part of the claimed design. The ceiling fan blades are shown with a symbolic break in their length. The appearance of any portion of the ceiling fan blades between the break lines forms no part of the claimed design.