noun
ōmi yari; long-bladed spear
Historical Japanese polearm with a blade length of 60 cm or more. Used primarily in the Sengoku period. The term is domain-specific to Japanese arms and armor.
大身槍は戦国時代に広く使われた長柄武器の一種である。
The ōmi yari is a type of polearm widely used during the Sengoku period.
この博物館には刃渡り70センチの大身槍が展示されている。
This museum displays an ōmi yari with a 70-centimeter blade.
長槍 emphasizes overall shaft length, whereas 大身槍 focuses on blade length.
Compound of 大身 (ōmi, 'large blade') and 槍 (yari, 'spear'). The exact historical derivation is uncertain, but the term straightforwardly describes the weapon's defining feature.