storey, n. (also story) (pl. -eys or -ies)
1 any of the parts into which a building is divided horizontally; the whole of the rooms etc. having a continuous floor (a third-storey window; a house of five storeys).
2 a thing forming a horizontal division.
-storeyed (in comb.) (also -storied).
ME f. AL historia HISTORY (perh. orig. meaning a tier of painted windows or sculpture)