Added 9 October 2026 subfamily noun Categories: SocietyRare Words noun ! Definition from WordNet 3.1, Princeton University. More about subfamily at Wordnik → Where our words come from → (biology) a taxonomic category below a family. Related Words: subtribesubspeciessubsectionsubtribussubordersupertribesubtaxonsuperordersectiongenussubmemberinfralegion Back to today's word