Entry 1 sense Webster, 1913 Helminth /hĕl'-mĭnth/ · Hel·minth · IPA /ˈhɛl.mɪnθ/ 01 n. An intestinal worm, or wormlike intestinal parasite; one of the Helminthes. 1. An intestinal worm, or wormlike intestinal parasite; one of the Helminthes.(Zool.)