ad·den·dum

[uh-den-duhm]
noun, plural ad·den·da [uh-den-duh] , for 1, 2; ad·den·dums for 3.
1.
a thing to be added; an addition.
2.
an appendix to a book.
3.
Machinery.
a.
the radial distance between the tip of a gear tooth and the pitch circle of a gear or the pitch line of a rack. Compare dedendum.
b.
Also called addendum circle. an imaginary circle touching the tips of the teeth on a gear.

Origin:
1785–95; neuter singular of Latin addendus to be added, gerundive of addere to add

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
addendum (əˈdɛndəm) [Click for IPA pronunciation guide]
 
n , pl -da
1.  something added; an addition
2.  a supplement or appendix to a book, magazine, etc
3.  the radial distance between the major and pitch cylinders of an external screw thread
4.  the radial distance between the pitch circle and tip of a gear tooth
 
[C18: from Latin, literally: a thing to be added, neuter gerundive of addere to add]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Addendum is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a scrap or morsel of food left at a meal.
Etymonline
Word Origin & History

addendum
1794, "something added," from L. neut. of addendus "that which is to be added," gerundive of addere (see add). Plural form is addenda.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Safraty said a rider, which will act as an addendum to a contract, will
  hopefully be adopted by the fall semester.
Addendum: actually, a lot of the details of timeline are problematic if you
  take them at face value.
The announcement seemed a hastily added addendum to the original address.
Many vehicles now offer cameras as an addendum to their navigation systems.
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