appendage
noun [ C ] formal uk/əˈpen.dɪdʒ/ us/əˈpen.dɪdʒ/
附加物，附属物
something that exists as a smaller and less important part of something larger
The committee is a mere appendage of the council and has no power of its own. 这个委员会只是政务会的一个附属机构，本身没有任何权力。
The organism has small leaf-like appendages. 这种生物体长有很小的叶状附属器官。
附肢;附（属）器（指臂、腿或身体其他部位）
an arm, leg, or other body part
He had a tattoo on every visible appendage. 他四肢裸露的地方都刺有纹身。