ban·is·ter also ban·nis·ter 
/ˈbænəstɚ/ noun
plural ban·is·ters /ˈbænəstɚ/ noun [count] : a structure like a fence with a bar on top that is built along the side of a set of stairs
▪ The children love to slide down the banister. ▪ She held the banister tightly. — sometimes plural in British English ▪ She held the banisters tightly.
▪ The children love to slide down the banister. ▪ She held the banister tightly. — sometimes plural in British English ▪ She held the banisters tightly.
