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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Collins
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Addendum is always a great word to know.
So is slumgullion. Does it mean:
a fool or simpleton; ninny.
a stew of meat, vegetables, potatoes, etc.
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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
This noteworthy addendum to Toscanini provides fresh insights, of interest to
  scholars and general music lovers alike.
Go back to your office and finish reading the addendum to the lease agreement.
If you change something, you can make an addendum for the next semester.
Their finding is worth noting as an addendum to your report.
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