Hydridi

Hydridi is a term that appears in limited, nonstandard usage and does not denote a single, widely accepted concept. Because it lacks an established definition in mainstream science, its meaning depends on context and author.

In chemistry and mineralogy, hydridi has often appeared as a historical or translational variant of hydride, or as a placeholder for hydrogen-bearing species. The standard term for compounds of hydrogen with other elements remains hydride, with prefixes and stoichiometries defined by established nomenclature. As a result, current reference works generally do not recognize hydridi as a distinct class of compounds.

In materials science and solid-state chemistry, some writers have used hydridi informally to describe hydrogen-rich intercalation compounds or metal-hydride–like materials. In these cases, hydridi is not an official category but a descriptive shorthand in nonstandard prose.

In fiction and speculative contexts, hydridi is sometimes adopted as a proper noun—designating an alien species, a planet, a cultural group, or a type of energy matter. Such usage is invented by authors and not related to standard chemical terminology.

Because hydridi does not have a formal, universally accepted definition, readers should consult the specific source to understand what the term means in that context. See also hydride, hydrogen storage materials, and intercalation compounds for related concepts.