A fibrous, membranous, or fatty sheath that encloses an organ or part, such as the sac surrounding the kidney or the fibrous tissues that surround a joint.

• 被膜，囊似纤维的，呈膜状或含很多脂肪的套，内包有一个器官或部位，如包裹着肾的囊或包裹着一个关节的纤维状组织