Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
A parasitic relationship is a type of symbiotic relationship where one organism benefits at the expense of another organism, which is harmed in the process.
Related terms
Host-parasite interaction: This term refers to the specific interaction between a parasite and its host.
Pathogen: A pathogen is an organism that causes diseases in its host.
Ectoparasite vs. Endoparasite: Ectoparasites live on the surface of their hosts (like ticks), while endoparasites live inside their hosts (like tapeworms).