regnum

A badge or mark of royalty or supremacy, generally a crown of some unusual character.

One of three main divisions of natural objects (collectively called Imperium Naturæ), technically classed as the Regnum Animale, R. Vegetabile, and R. Minerale: used by the older naturalists before and for some time after Linnæus, and later represented by the familiar English phrases animal, vegetable, and mineral kingdom. (See kingdom, 6.) A fourth, R. Primigenium, was formally named by Hogg. See Primalia, Protista.

A rank in the classification of organisms, also known as kingdom