dampyIn coal-mining, said of air when it is mixed with choke-damp to such an extent that candles will no longer burn in it.
They nestled close together,
On the cold and dampy ground,
And as the storm rush'd past them,
They trembled at the sound.
"Who Cares?" by John Hartley
This clari ﬁes the distinction between hot and cold dark matter: Hot dark matter (HDM) consists of fast particles that damp away small-scale perturbations, while cold dark matter (CDM) particles are slow enough to cause no signi ﬁcant dampi ng.