Meaning of dedendum in English:


Pronunciation /dɪˈdɛndəm/


  • The radial distance from the pitch circle of a cogwheel or wormwheel to the bottom of the tooth space or groove.

    Compare with addendum

    ‘Gears have addendums and dedendums that are the amount of tooth above and below the pitch line.’
    • ‘You do need a hob drawing which would have the addendum equal to the dedendum of the gear you are cutting.’
    • ‘The dedendum of the spur gear must be greater than the addendum of the lantern gear to prevent interference.’
    • ‘The base, standard pitch, addendum and dedendum circles are dashed, and the rack reference origin is highlighted.’
    • ‘Moderate scoring shows up as a characteristic wear pattern, often in patches on the addendum, dedendum, or both.’


Early 20th century from Latin, ‘thing that can be surrendered’, neuter gerundive of dedere.