Added 10 October 2026 vacc noun Categories: Obscure Words noun ! Definition from Wiktionary (CC BY-SA). More about vacc at Wordnik → Where our words come from → Clipping of vaccine. Related Words: vaccineinoculationvaccinumimmunovaccineimmunoprophylaxisantigenimmunoadjuvantvaccinotherapyadjuvantboosteradeno Back to today's word