subkingdom
/ˈsʌbˌkɪŋdəm/
noun
- A major category in biological classification, ranking below a kingdom and above a phylum or division.
- The plant kingdom has several subkingdoms, including vascular and nonvascular plants.
- Biologists use subkingdoms to organize the huge variety of living things.
- Animals are divided into subkingdoms such as vertebrates and invertebrates.