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 elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational 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.