Толковый словарь английского языка Oxford English Reference - stair

n. 1 each of a set of fixed indoor steps (on the top stair but one). 2 (usu. in pl.) a set of indoor steps (passed him on the stairs; down a winding stair). 3 (in pl.) a landing-stage. Phrases and idioms stair-rod a rod for securing a carpet in the angle between two steps. Etymology: OE st{aelig}ger f. Gmc