The ornamental design for a ceilingfan, as shown and described.
FIG. 1 is a perspective view from below of a ceiling fan in accordance with my design;
FIG. 2 is a reduced top plan view of the ceiling fan in accordance with my design;
FIG. 3 is a reduced bottom plan view of the ceiling fan in accordance with my design;
FIG. 4 is an enlarged front elevation view of the ceiling fan in accordance with my design;
FIG. 5 is an enlarged back elevation view of the ceiling fan in accordance with my design; and,
FIG. 6 is an enlarged side elevation view of the ceiling fan in accordance with my design, the opposite view being a mirror image of that shown except for the positioning of the fan blades.
The broken line showing of the fan blade attachment element is included for the purpose of illustrating environmental structure and forms no part of the claimed design.