1 historicalthe German Emperor, the Emperor of Austria, or the head of the Holy Roman Empire:
[as title]Kaiser Wilhelm.
2 North Americana round, soft bread roll with a crisp crust, made by folding the corners of a square of dough into the center, resulting in a pinwheel shape when baked.
– PHRASES the Kaiser's Wardated World War I.
– DERIVATIVES kaisership/-ˌSHip/noun
– ORIGIN Middle English cayser, from Old Norsekeisari, based on LatinCaesar (see Caesar1), and later reinforced by Middle Dutchkeiser. The modern English form (early 19th century) derives from GermanKaiser.