| parasite | | |
| n. (animal) | 1. parasite | an animal or plant that lives in or on a host (another animal or plant); it obtains nourishment from the host without benefiting or killing the host. |
| ~ organism, being | a living thing that has (or can develop) the ability to act or function independently. |
| ~ plant life, flora, plant | (botany) a living organism lacking the power of locomotion. |
| ~ endoparasite, endozoan, entoparasite, entozoan, entozoon | any of various parasites that live in the internal organs of animals (especially intestinal worms). |
| ~ ectoparasite, ectozoan, ectozoon, epizoan, epizoon | any external parasitic organism (as fleas). |
| ~ parasitic plant | plant living on another plant and obtaining organic nutriment from it. |
| n. (person) | 2. leech, parasite, sponge, sponger | a follower who hangs around a host (without benefit to the host) in hope of gain or advantage. |
| ~ follower | a person who accepts the leadership of another. |
| pest | | |
| n. (state) | 1. pest, pestilence, pestis, plague | a serious (sometimes fatal) infection of rodents caused by Yersinia pestis and accidentally transmitted to humans by the bite of a flea that has bitten an infected animal. |
| ~ epidemic disease | any infectious disease that develops and spreads rapidly to many people. |
| ~ bubonic plague, glandular plague, pestis bubonica | the most common form of the plague in humans; characterized by chills, prostration, delirium and the formation of buboes in the armpits and groin; does not spread from person to person. |
| ~ plague pneumonia, pneumonic plague, pulmonic plague | a rapidly progressive and frequently fatal form of the plague that can spread through the air from person to person; characterized by lung involvement with chill, bloody expectoration and high fever. |
| ~ septicemic plague | an especially dangerous and generally fatal form of the plague in which infecting organisms invade the bloodstream; does not spread from person to person. |
| n. (state) | 2. pest, pestilence, plague | any epidemic disease with a high death rate. |
| ~ epidemic disease | any infectious disease that develops and spreads rapidly to many people. |
| n. (person) | 3. blighter, cuss, gadfly, pest, pesterer | a persistently annoying person. |
| ~ nudnick, nudnik | (Yiddish) someone who is a boring pest. |
| ~ persecutor, tormenter, tormentor | someone who torments. |
| n. (animal) | 4. pest | any unwanted and destructive insect or other animal that attacks food or crops or livestock etc..; "he sprayed the garden to get rid of pests"; "many pests have developed resistance to the common pesticides" |
| ~ animal, animate being, beast, creature, brute, fauna | a living organism characterized by voluntary movement. |
| ~ vermin | any of various small animals or insects that are pests; e.g. cockroaches or rats.; "cereals must be protected from mice and other vermin"; "he examined the child's head for vermin"; "boys in the village have probably been shooting vermin" |
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