The ornamental design for a wineglassholder, as shown and described.
FIG. 1 is a top front perspective view of the wine glass holder;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevation thereof;
FIG. 5 is a rear elevation thereof;
FIG. 6 is a first side elevation thereof;
FIG. 7 is a second side elevation thereof;
FIG. 8 is a top front perspective view of the wine glass holder in implementation, whereby the wine glass holder is situated on a wine bottle and holding wine glasses; and,
FIG. 9 is a top rear perspective view of the wine glass holder in implementation, whereby the wine glass holder is situated on a wine bottle and holding wine glasses.
The broken-lines of the figures depict a wine bottle as well as wine glasses. These broken line features are depicted for illustrative and contextual purposes, and form no part of the claimed design.