1. trunk; torso; body; abdomen; waist
胴は太く、他の馬よりも脚が短い。The torso is thick, and the legs are shorter than those of other horses.
2. plastron (in kendo); touching the plastron (kimari-te in kendo)
彼は胴はまだつけているが、面は取っている。He still has his chest protector on, but he's taken off his mask.
3. frame (of a drum, etc.); sound box (of a shamisen, etc.); hull (of a ship)
4. dealer
also written as 筒