The ornamental design for a butterdish, as shown and described.
FIG. 1 is an isometric view of an embodiment of the butter dish;
FIG. 2 is a front view of the butter dish, and is interchangeable with a back view of the butter dish;
FIG. 3 is a right side view of the butter dish, and is interchangeable with a left side view of the butter dish;
FIG. 4 is a top plan view of the butter dish;
FIG. 5 is a bottom pan view of the butter dish;
FIG. 6 is a front view of the butter dish with an accompanying knife and butter, the knife and butter represented by dashed lines and not included in the invention disclosed herein;
FIG. 7 is a right side view of the butter dish with butter, the butter represented by dashed lines and not included in the invention disclosed herein;
FIG. 8 is an isometric view of the butter dish with two accompanying knives and butter, the knives and butter represented by dashed lines and not included in the invention disclosed herein;
FIG. 9 is a front view of the butter dish with an accompanying knife, butter and lid; the knife, butter and lid represented by dashed lines and not included in the invention disclosed herein; and,
FIG. 10 is a front view of the butter dish with an accompanying knife, butter and second embodiment of a lid; the knife, butter and lid represented by dashed lines and not included in the invention disclosed herein.