An organism which lives in or on another organism (its host) and benefits by deriving nutrients at the other’s expense
Sam was a parasite with no interest in anything but drink and gambling
The part of the drag on an aircraft or aerofoil which arises through friction, i.e. the part not attributable to lift; profile drag.
An animal that lays its eggs in the nest of another animal (of the same or a different species), leaving the host to care for them and the eventual young, to the detriment of the host's young.
A protozoan of the genus Plasmodium (phylum Apicomplexa), the members of which cause malaria in vertebrates.
A fighter jet carried by and operating from another aircraft.