appendage

n. 附加物, 附器
【医】 附件, 附器

ap.pend.age

n.（名词）
Something added or attached to an entity of greater importance or size; an adjunct.
附属物，附件，附加物：附加或附在更重要或更大实体上的东西；附加物
Biology A part or an organ, such as an arm, a leg, a tail, or a fin, that is joined to the axis or trunk of a body.
【生物学】 附器，附肢：与身体的轴或躯干相连的部位或器官，如胳膊、腿、尾或鳍

<参考词汇><同义词>appendage,appurtenance,adjunct,accessory,attachmentThese nouns denote subordinate elements that are added to another entity. An
这些名词均指加到另一实体上的从属成份。
appendage supplements without being essential:
appendage 表示没有必要增加的：
例句：
.Water jets can be angled to either side, making rudders unnecessary, and the complete absence of appendages at the stern decreases hull resistance. (R.J.L. Dicker). An
.水上喷气式飞机可不用方向舵而转向任何一个角度，同时因机尾完全没有附加部分而减少了机身阻力. （R.J.L.迪克）。

appurtenance belongs naturally as a subsidiary attribute, part, or member to that with which it is associated:
appurtenance 则表示作为一附属物自然地成为其相连对象的一部分或一成员：
例句：
.an internationally known first-class hotel . . . equipped with such appurtenances as computers, word processors, copiers and telex. (Oscar Millard). An
.一家举世闻名一流饭店…装备有计算机、文字处理机、复印机及传真机等设施. （奥斯卡·密拉德）。

adjunct is added as an auxiliary to something else but is often self-sustaining:
adjunct 作为辅助物加到别的东西上，却常能自成一体：
例句：
.Intelligence analysts say they believe that of all the countries of the Middle East, none use terrorism more effectively as an adjunct to diplomacy than Syria. (Elaine Sciolino). An
.情报分析家说，他们相信中东所有国家中，没有哪一个比叙利亚更有效地把恐怖主义作为外交的辅助手段. （伊莉思·西奥利诺）。

accessory is usually nonessential but desirable and adds to the effect of something already complete in itself:
accessory 指通常不必要但却使人渴望，并且附加到某种本身已非常完美的东西上来增加效果：
例句：
We bought a car with such accessories as air conditioning, stereo, and a sunroof. An
我们购买了一辆带有空调、立体音响和汽车天窗的车。

attachment contributes a supplementary function to the principal thing, to which it can be physically linked:
attachment 对主要部分起补充作用，这种附加可以与主要部分自然地连接起来：
例句：
The food processor has an attachment for making pasta.
这种食品加工机具有制作意大利食品的附加装置。