subkingdom

/ˈsʌbˌkɪŋdəm/
noun
  1. 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.
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