Relating to or characteristic of a parasite; living at the expense of another organism. The parasitic plant drew nutrients from the host tree, weakening it over time.
Habitually relying on or exploiting others for support or advantage. His parasitic behavior was evident as he constantly borrowed money without any intention of repaying it.
In engineering and electronics, denoting an unwanted or incidental characteristic, component, or effect that degrades the performance of a system. Parasitic capacitance limited the amplifier's high-frequency response.