n.[C]

1. 附屬物，附加物[（+to/of）]
   as an appendage to something

   作為某物的附屬部分

2. 【生】附屬器官，附屬肢體（如臂、腿、尾等）

n.

1. a thing attached to something larger or more important.
2. Biology  a projecting part of an organism, with a distinct appearance or function.