Added 9 October 2026 subkingdom noun Categories: SocietyObscure Words noun ! Definition from WordNet 3.1, Princeton University. More about subkingdom at Wordnik → Where our words come from → (biology) a taxonomic group comprising a major division of a kingdom. Related Words: subdominionsuperregnumsuperclasssuperkingdomkingdomsuperdomainspeciessubspregnumsupertaxonomyclassdivisio Back to today's word