dedendum

[dih-den-duhm]

noun, plural de·den·da

[-duh] . Machinery.

(on a gear or rack) the radial distance between the pitch circle or line and the root circle or line. Compare addendum (def. 3a).

Origin:
1900–05; < Latin: to be given up, gerund of dēdere, equivalent to dē- de- + -dere combining form of dare to give; see addendum

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Dedendum is always a great word to know.

So is slumgullion. Does it mean:

a stew of meat, vegetables, potatoes, etc.

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

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de·den·dum