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Spending different stages of the life cycle on different, usually unrelated hosts. Used of parasites.
het′er·oe′cism (-sĭz′əm) n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
heteroecious(of rust fungi) having different spore forms on different host plants.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005