par·a·ten·ic host 
(păr′ə-tĕnĭk)
(păr′ə-tĕnĭk)n.
An organism that plays a role in a parasite's life cycle, as by harboring its unhatched eggs, but in or on which no development of the parasite occurs.
[Greek parateinein, to extend, prolong (para-, para- + teinein, to stretch; see ten- in the Appendix of Indo-European roots) + -IC.]