1931, "pertaining to the reign of Wilhelm II," emperor of Germany 1888-1918, from German Wilhelm (see William).
Examples from the Web for wilhelmine
The elaborate waterworks and strange devices could not be quite unhinged, Wilhelmine reflected idly.
Wilhelmine reflected that she would be at liberty to observe Eberhard Ludwig at her leisure during the dance.
But these softer moods were rare; in Wilhelmine's life there was little to call forth a gentle feeling.
The angry look which Wilhelmine bestowed upon him, repressed his words, and he quickly assumed a melancholy, submissive manner.
“Thou hearest him, O God,” cried Wilhelmine, raising her arms toward heaven.