RISER


Meaning of RISER in English

/ ˈraɪzə(r); NAmE / noun

1.

early / late ~ a person who usually gets out of bed early / late in the morning

2.

( technical ) the vertical part between two steps in a set of stairs

—picture at staircase

—compare tread

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.