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addendum - 5 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
ad·den·dum     (ə-děn'dəm)  Pronunciation Key 
n.   pl. ad·den·da (-də)
Something added or to be added, especially a supplement to a book.

[Latin, neuter gerundive of addere, to add; see add.]

addendum 
1794, from L. neut. of addendus "that which is to be added," ger. of addere (see add). Plural form is addenda.

addendum

noun
textual matter that is added onto a publication; usually at the end 

Addendum

Ad*den"dum\, n.; pl. Addenda. [L., fr. addere to add.] A thing to be added; an appendix or addition.

Addendum circle (Mech.), the circle which may be described around a circular spur wheel or gear wheel, touching the crests or tips of the teeth. --Rankine.

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