Definicija: Organism which lives and obtains food at the expense of another organism, the host.

Definicija: Organizem, ki živi in dobiva hrano na račun drugega organizma, gostitelja.

Definicija: A branch of biology which deals with those organisms, plant or animal, which have become dependent on other living creatures.

Definicija: Biološka veja, ki se ukvarja z organizmi, rastlinami ali živalmi, ki so postali odvisni od drugih živih bitij.