The ornamental design for a dropper, as shown and described.
FIG. 1 is a perspective view of a dropper showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line portions depicted with the claimed dropper are shown to indicate that the precise length of the tubing and the precise shape and size of the reservoir are not claimed. None of the broken lines form any part of the claimed design.
The subject design is directed toward ornamental aspects of a dropper for personal, medical or laboratory purposes.