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Ob Oc Od Ol Om Op Or Os Ot Ov Ox
Obl Obt

Obligate parasite

1. A parasitic organism that cannot complete its life cycle without exploiting a suitable host. If an obligate parasite cannot obtain a host it will fail to reproduce. (wikipedia.org)

2. An organism that occurs in intimate association with, and which is wholly dependent for its nutrition on, another living organism (Holliday, 1989).