addendum
/əˈdendəm/noun
(pl.addenda /-də/)
1
- an item of additional material added at the end of a book or other publication附录, 补遗。
2
- Engineering the radial distance from the pitch circle of a cogwheel or wormwheel to the crests of the teeth or ridges【工程】（嵌齿轮或蜗轮）齿高, 齿顶。比较DEDENDUM.
词源
late 17th cent.: Latin， that which is to be added， gerundive of addere （see ADD）.