Gerund
a gerund is a verb form which functions as a noun, in Latin having a (declinable) ending -ndum, and in English ending in -ing
Do you mind my doubting you? (as Rene Descartes once said to himself). Compare with a gerundive, a verb which functions as an adjective.
Where better to end than the grate n molesworth, the curse of st custards, as any fule kno.
See also
Plain English Anatomy™ Noun | Verb | Adjective | Adverb | Preposition | Conjunction | Latin | Germany | Flannel | Legal triplicate | Nominalisation | Murder your darlings