The ornamental design for a spicegrinder, as shown and described.
FIG. 1 is a front top perspective view of a spice grinder according to the new design;
FIG. 2 is a rear bottom perspective view thereof;
FIG. 3 is a front elevation view thereof, wherein each of the rear elevation view, the left-side elevation view, and the right-side elevation view thereof is identical thereto;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
The broken lines illustrate portions of the spice grinder that form no part of the claimed design.