plural of draff

(physics) The CGS unit of electric dipole moment, defined as 1 D = 10⁻¹⁸ statcoulomb-centimetre and computable from the SI unit coulomb-metre by multiplying by the factor 3.33564 × 10⁻³⁰.

(geology) Of a geologic period within the Paleoproterozoic era from about 1800 to 1600 million years ago.

(slang) A fruit machine.