(physics) A localized surface soliton that causes a temporary decrease in an associated wave amplitude

(fluid dynamics) The phenomenon by which a fluid parcel is permanently displaced after the passage of a body through a fluid – the fluid being at rest far away from the body.

(astrophysics, cosmology, astronomy, physics) A hypothetical force of nature that acts on dark matter to allow dark matter to interact with itself.

(slang) Synonym of black light (ultraviolet light)

(euphemistic, dated) A female prostitute.

plural of nymph of darkness

A blue daisy (Catananche caerulea)

The date of February 12, an annual celebration of the birth of Charles Darwin in 1809.

A calcareous spicule that a gastropod mollusc drives into the body wall of its partner prior to copulation.

Percina tanasi, a freshwater fish of the perch family, found in East Tennessee, United States.