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addendum circle

 - 2 dictionary results

ad⋅den⋅dum

[uh-den-duhm]
–noun, plural -da [-duh] for 1, 2; -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; neut. sing. of L addendus to be added, gerundive of addere to add
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Word Origin & History

addendum 
1794, from L. neut. of addendus "that which is to be added," ger. of addere (see add). Plural form is addenda.
Online Etymology Dictionary, © 2001 Douglas Harper
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