noun
ō-yoroi; box-shaped heavy armor used on horseback
Historical term for a type of Japanese armor worn by samurai from the Heian to early Muromachi periods, characterized by a boxy shape and designed primarily for mounted archery.
博物館で大鎧の展示を見た。
I saw an exhibition of ō-yoroi at the museum.
大鎧は主に騎乗の武士が使用した。
Ō-yoroi was mainly used by mounted warriors.