(chemistry) Containing nitric and hydrochloric ions, see nitro-hydrochloric acid.

(chemistry) aqua regia

plural of hydroelectric dam

plural of hydroelectric generator

plural of hybrid wave function

(geology) A material property (e.g., for rocks or soil) that describes the rate which water can flow through pore spaces or fractures. SI units: m/s. Symbol: K.

Crocuta crocuta, largest of the hyena species.

The smallest of the true hyenas, Hyaena hyaena.

A comparatively rare species of hyena, Hyaena brunnea, endemic to desert and semi-desert areas and open woodland savannahs of southern Africa.

plural of hydrogen gas electrode