What does genii mean?
“Genii” is the plural of “genus,” a taxonomic rank that groups closely related species. In formal biological writing, both “genii” and “genera” are recognized, although “genera” is the more usual plural; the two forms refer to the same kind of classification. Thus, a paper might discuss several “genii” within a family, or a field guide might distinguish between them. The word is a learned borrowing rather than everyday vocabulary and is chiefly found in scientific, taxonomic, and historical writing. “Genii” also has an older literary sense as the plural of “genius,” meaning a tutelary spirit or supernatural attendant, as in references to the genii of the East. That older sense should not be confused with the modern plural “geniuses,” now preferred for exceptionally talented people. Although “genera” is usually clearer in contemporary science, “genii” is fully established and useful when the writer wants the distinctive learned form.
nounThe plural of genus, a taxonomic category containing one or more related species. In older usage, it can also be the plural of genius in the sense of a tutelary or supernatural spirit.
- The plural of genus, used especially in biological classification to refer to two or more taxonomic genera.
- The older plural of genius, referring to tutelary spirits, supernatural beings, or figures represented as spirits in literature and folklore.
"The survey recorded two genii adapted to very different habitats."
"The researchers compared the distribution of several genii across the island."
"The genii who guarded the hidden treasure appeared when the seal was broken."
Genii is itself an established plural of genus rather than a singular noun; genera is the more common alternative plural.
"The catalogue includes four genii and dozens of species."
Genii and genera are rival plurals of genus—two respectable routes into the same taxonomic rank.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does genii come from?
Genus comes from Latin genus, meaning “kind,” “class,” or “type.” Latin has the regular plural genera, while genii became an established learned alternative plural in English, particularly in biological classification. In its older spiritual sense, genii is the plural of genius, borrowed from Latin genius, originally denoting a tutelary spirit or an innate quality associated with exceptional talent.
How genii is actually used
The taxonomic use is formal and scientific; genii remains established but is less usual than genera. The older spirit sense is literary, historical, and markedly archaic rather than part of ordinary modern usage.
Easily confused with genii
Genera is the more usual modern plural of genus in biological and taxonomic writing, while genii is an established classical alternative.
Geniuses is the usual modern plural of genius when referring to exceptionally talented people, whereas genii survives chiefly in the older sense of tutelary spirits.