From Wiktionary, the free dictionary
From Japanese 木刀 (bokutō).
bokuto (plural bokutos)
- bokken, a wooden katana used for practice.
2002 October 31, RICMRUNNER, “Japanese swords”, in rec.arts.anime.misc[1] (Usenet):Someone said that a bokuto approximates the weight and size/length of a katana. I would agree on size/length, but definitely not weight.