(informal) The spotted hyena (Crocuta crocuta); so called because of the resemblance of its call to human laughter.

Alternative spelling of hyena

(biology) Offspring resulting from cross-breeding different entities, e.g. two different species or two purebred parent strains.

Consisting of diverse components.

Any of the medium-sized to large feliform carnivores of the subfamily Hyaenidae, native to Africa and Asia and noted for the sound similar to laughter which they can make if excited.

Any of several small freshwater polyps of the genus Hydra and related genera, having a naked cylindrical body and an oral opening surrounded by tentacles.

The engineering science that deals with practical applications where liquid is in motion and transmits energy. / The hydraulic system of a vehicle or other machine.

Deuterium.

(inorganic chemistry) A strong acid made by dissolving the gas, hydrogen chloride, in water. It reacts with alkalis, bases and many metals to form chlorides; it has many industrial applications.

(pathology) An aversion to water, as a symptom of rabies; the disease of rabies itself. / (psychology, colloquial) A morbid fear of water; aquaphobia.