Home›Browse›P›parasiticparasiticOur editors are putting together more complete content — check back in about 20 minutesparasiticparasitic — adjectiveadjective1. living on or inside another organism and benefiting from it at its expense1.adjectiveDefinitionliving on or inside another organism and benefiting from it at its expenseExampleThe parasitic worm lived in the host's intestine.