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heteroecious het·er·oe·cious (hět'ə-rē'shəs)
Spending different stages of a life cycle on different, usually unrelated hosts. Used of parasites such as rust fungi and tapeworms.
Relating to a parasite that spends different stages of its life cycle on different, usually unrelated hosts. The term is used especially of certain kinds of rust fungi, but may also be applied to other parasites like tapeworms. Compare autoecious.