An organism that harbors the adult stage of a parasite is referred to as:

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The definitive host is an organism in which the adult stage of a parasite lives and reproduces sexually. This is in contrast to intermediate hosts, which typically only harbor the immature or asexual stages of a parasite, and paratenic hosts, which serve as a temporary refuge or transport for the parasite but are not necessary for its life cycle. Symbiotic host is a vague term, and could refer to any organism that engages in a symbiotic relationship with another species.

An Organism That Harbors the Adult Stage of a Parasite