What is a parasite?

What is a parasite? Here are some definitions.

Noun
  1. (pejorative) A person who lives on other people's efforts or expense and gives little or nothing back. [from 16th c.]
  2. (biology) An organism that lives on or in another organism, deriving benefit from living on or in that other organism, while not contributing towards that other organism sufficiently to cover the cost to that other organism.
  3. (literary) A climbing plant which is supported by a wall, trellis etc. [from 19th c.]
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They then watched as sporozoites traversed Kupffer cells using a special process distinct from ordinary parasite locomotion.
During the 15th century, a parasite in the wheat was causing a dread disease for which there was no cure.
The presence of a commensal parasite that can display mutualism within a clade of known pathogens suggests dynamic evolutionary interactions.
Possible outcomes are given for a host adopting either the acceptor or rejector strategy when the parasite is a nonevictor.
The acanthocephalan Leptorhynchoides is a parasite of vertebrate carnivores which looks a little like a nemertine worm with training wheels.
Most of the patients had a parasite count of more than 10 percent, which is critical.

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