noun
round shield; buckler
A small, round shield historically used in hand-to-hand combat. Often associated with medieval European or fantasy contexts in modern Japanese.
騎士は左手に円盾を構えた。
The knight held a round shield in his left hand.
このゲームでは円盾は軽くて扱いやすい。
In this game, the buckler is light and easy to handle.