back (of a person); one's back
Refers specifically to the human back as a body part. Often used in medical or descriptive contexts.
Used for the back or rear side of objects, such as furniture, devices, or buildings. More formal than 後ろ.
He felt a slight pain in his back.
Please keep the back of the refrigerator a little away from the wall.
Compound of 背 (はい, 'back') and 部 (ぶ, 'part'). A straightforward Sino-Japanese formation.