This page provides all possible meanings and translations of the word odachi
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A long Japanese sword built like the katana but made to be longer (about 4 to 6 feet long) for combat on horseback
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An ōdachi was a type of long traditionally made Japanese sword used by the samurai class of feudal Japan. The term nodachi refers to the same type of sword.
The character for ō means "big" or "great". The characters for da and chi are the same as tachi, the older style of sword/mounts that predate the katana. The chi is also the same character as katana and the tō in nihontō, originally from the Chinese character for a knife, dāo.
To qualify as an ōdachi, the sword in question would have a blade length of around 3 shaku however, as with most terms in Japanese sword arts, there is no exact definition of the size of an ōdachi.
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