Added 9 October 2026 tum /tʌm/ noun Categories: The BodyRare Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about tum at Wordnik → Where our words come from → An enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion. Related Words: tummystomachbreadbaskettomtomethomtum-tumtushytummyachetiddytumulosity Back to today's word