The ?dachi () (large/great sword) or nodachi (, field sword)^{You are not allowed to view links. Register or LoginYou are not allowed to view links. Register or LoginYou are not allowed to view links. Register or Login} is a type of traditionally made You are not allowed to view links. Register or Login (, nihont?)^{You are not allowed to view links. Register or LoginYou are not allowed to view links. Register or Login} used by the You are not allowed to view links. Register or Login class of feudal Japan. The Chinese equivalent of this type of sword in terms of weight and length is the You are not allowed to view links. Register or Login or the earlier You are not allowed to view links. Register or Login, and the Western battlefield equivalent (though less similar) is the You are not allowed to view links. Register or Login.

To qualify as an ?dachi, the sword in question would have a You are not allowed to view links. Register or Login length of around 3 You are not allowed to view links. Register or Login (90.9 cm (35.8 in)). However, as with most terms in Japanese sword arts, there is no exact definition of the size of an ?dachi.

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