Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
TWL06 (NASPA List 2006)
"Dedendum" Definition
noun
The difference between the radius of the pitch circle of a gear and its root circle.
Source: Wiktionary
That part of the tooth of a cog-wheel or gear which is inside the pitch-circle and is intercepted between the pitch-line and the circle which limits all the roots of the teeth and the spaces between them. the addendum of the teeth of the meshing-wheel enters into this space.
Source: Century Dictionary
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