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Definition: In English, the word 'parasite' refers to an organism that lives inside another organism (usually a host animal). This living entity can be a parasite such as a virus or bacteria, but more commonly, it refers to an animal which has been exposed to a harmful organism and needs to digest the organism in order to survive.
Definition: Parasitology is a biological discipline that studies parasites, which are organisms that feed on living hosts. It is an area of research that examines how parasitic infections affect individuals, their immune systems, and the overall health of the host population. The field of parasitology was established in the late 19th century by German zoologist Carl Friedrich Gauss as a way to understand the role that parasites play in causing diseases. The term "parasite" originally referred to a type of organism that lived on or within another organism, but it was eventually expanded to include all forms of living organisms. The definition of parasitology is broad and can be applied to any organism that feeds on another organism. Some common examples of parasites include bacteria, viruses, fungi, protozoa, nematodes, and arthropods (such as flies and ants). Parasites play a crucial role in the world's ecosystems by providing essential nutrients for other organisms and helping to maintain balance between different species. In addition to their direct impact on animals and humans, parasites also have significant ecological impacts such as pollution and habitat destruction. The study of parasitology has several important applications, including understanding disease transmission through infection, identifying ways to manage and control parasitic infections, and developing new treatments for diseases caused by these organisms.