One who breakfasts.
1834. North Wales Chron., 22 July, 4/3. The breakfasters upon cold beef and cool tankards were an active horse-riding generation.
1845. Syd. Smith, Irish Rom. Cath. Ch., Wks. 1859, II. 334/1. Oh, dont you know what has happened? said the sacred breakfaster.
1864. Realm, 13 April, 6. There are plenty of bad breakfasters.