An organism which supports the adult or sexually reproductive form of a parasite. Compare with intermediate host.
- The worms were using hyena and large cats as definitive hosts and bovids as intermediate hosts.
- Once in the definitive host's gut, the tapeworm larvae mature into adults and shed eggs, completing the cycle.
- The next step in the typical, three-host life cycle invariably requires a predatory act by the definitive host.
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