noun
- a kingdom or realm, especially in biological taxonomy referring to the highest taxonomic category
Usage: scientific; Latin
Examples
- The animal regnum includes all multicellular organisms that consume other organisms for food.
- Botanists classify plants within the plant regnum based on their cellular structure.
- The regnum Animalia encompasses everything from simple sponges to complex mammals.
- Scientists debate whether viruses belong to any established regnum.
- The fungal regnum was once considered part of the plant kingdom.
- Each regnum represents a major branch in the tree of life.