regnum

noun — 2 senses

regnum

noun

US, UK /ˈɹɛɡnəm/

Etymology From Latin rēgnum (“kingdom”). Doublet of reign.

1

Biology, Natural sciences, Taxonomy A rank in the classification of organisms, below dominium and above divisio.

2

A badge of royalty, especially the early form of the pope's tiara.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.