1) Of parasites 
A heteroecious parasite is one that requires at least two hosts. The primary host is the host in which the parasite spends its adult life; the other is the secondary host. Both the primary host and an unrelated alternate host are required for the parasite to complete its life cycle. This can be contrasted with an autoecious parasite which can comp...
parasitism upon several hosts
Requiring more than one host species to complete a life cycle (e.g., of Uredinales) 
• (a.) Passing through the different stages in its life history on an alternation of hosts, as the common wheat-rust fungus (Puccinia graminis), and certain other parasitic fungi; -- contrasted with autoecious.
<microbiology> Term used to describe a parasite that uses more than one hosts during its life cycle. ... Compare: autoecious. ... (09 Oct 1997) ... 
With an annual alternation between primary and secondary hosts (usually unrelated) (opposite of autoecious). Pertaining especially to rust fungi.
[adj] - of parasitic animals 2. [adj] - of parasites
heteroecious 1. A parasite occupying two or more different hosts at different stages of a life cycle. 2. A non host-specific parasite. 3. A reference to a unisexual organism in which male and female gametes are produced by different individuals.
adjective of parasites; passing through different stages of the life cycle on different host species; `heteroecious fungi`; `heteroecious insects`
Refers to seed-bearing plants that die to the ground each year, commonly used when describing perennials.