(ひじか)

ひじかけ
noun
armrest
furniture
1. armrest
The part of a chair, sofa, or seat designed to support the arm. Found on office chairs, airplane seats, theater seats, and sofas.
I rested my arm on the armrest of the chair.
I fought over the armrest with the person sitting next to me on the plane.
This armchair is comfortable and doesn't tire you out even during long work sessions.

A compound of (ひじ) (elbow) and ()け (rest/support). Refers to the part of a chair or seat designed to support the arm.

Common collocations

Where you encounter armrests

The compound 肘掛(ひじか)椅子(いす) specifically refers to an armchair — a chair with armrests, as opposed to a simple 椅子(いす).