A riser is a term commonly used in the context of a staircase. It refers to the vertical portion between two consecutive steps or treads in a staircase. In simpler terms, a riser is the part of the staircase that you step up onto when ascending a set of stairs. It helps to provide support and create a safe and stable structure for the stairs.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Staircase part. Explanations are generated by AI and may be inaccurate.