English Etymology From Latin dedere. Noun dedendum (plural dedendums or dedenda) The difference between the radius of the pitch circle of a gear and its root circle. See also addendum Anagrams muddened Latin Participle dēdendum inflection of dēdendus: nominative/accusative/vocative neuter singular accusative masculine singularWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads