The word soufflé is the past participle of the French verb souffler which means "to blow up" or, more loosely, "puff up"—an apt description of what happens to this combination of custard and egg whites.
The word soufflé is the past participle of the French verb souffler which means "to blow up" or, more loosely, "puff up"—an apt description of what happens to this combination of custard and egg whites.