present participle of duff

simple past tense and past participle of duff

A surname.

(mathematics) A nonlinear second-order differential equation used to model certain damped and driven oscillators.

plural of Duffing equation

A kind of coarse woolen cloth, having a thick nap or frieze. / (US, colloquial) Outfit or supplies, collectively; kit.

(dialectal) Dough. / A stiff flour pudding, often with dried fruit, boiled in a cloth bag, or steamed. / A pudding-style dessert, especially one made with plums.

(Scotland, US) Decaying vegetable matter on the forest floor. / Coal dust, especially that left after screening or combined with other small, unsaleable bits of coal.

(UK) Worthless; not working properly, defective.

(US, slang) The buttocks.