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1. an animal or plant that harbors and provides sustenance for another organism (the parasite).
2. the recipient of an organ or other tissue derived from another organism (the donor).
accidental host one that accidentally harbors an organism that is not ordinarily parasitic in the particular species.
definitive host (final host) a host in which a parasite attains sexual maturity.
intermediate host a host in which a parasite passes one or more of its asexual stages; usually designated first and second, if there is more than one.
paratenic host a potential or substitute intermediate host that serves until the appropriate definitive host is reached, and in which no development of the parasite occurs; it may or may not be necessary to the completion of the parasite's life cycle.
host of predilection the host preferred by a parasite.
primary host definitive host.
reservoir host an animal (or species) that is infected by a parasite, and which serves as a source of infection for humans or another species.
secondary host intermediate host.
transfer host one that is used until the appropriate definitive host is reached, but is not necessary to completion of the life cycle of the parasite.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


The organism in or on which a parasite lives, deriving its body substance or energy from the host.
[L. hospes, a host]
Farlex Partner Medical Dictionary © Farlex 2012


1. Biology
a. An organism on which or in which another organism lives.
b. A cell that has been infected by a virus or other infective agent.
2. Medicine The recipient of a transplanted tissue or organ.

host′ly adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


Epidemiology Any organism that can be infected by a pathogen under natural conditions. See Definitive host, Intermediate host, Paratenic host, Transport host Immunology Graft recipient. See Graft, Transplant Informatics A networked computer that performs centralized functions–eg, providing access program or data files to computers in a network; a host may be self-contained or located on Internet; computer that acts as a source of information or capabilities for multiple terminals, peripherals and/or users. See Node, Network. Cf Server.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


The organism in or on which a parasite lives, thus deriving its body substance or energy.
[L. hospes, a host]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


1. An organism that provides a residence and nourishment for a parasite.
2. A person receiving a graft of a donated organ or tissue.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


  1. the organism on which a PARASITE lives.
  2. the recipient of a tissue transplant.
  3. the recipient of recombinant VECTOR molecules (in GENETIC ENGINEERING) or other genetic elements, which can maintain and propagate them.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005


The organism that harbors or nourishes another organism (parasite). In bartonellosis, the person infected with Bartonella basilliformis.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

Patient discussion about host

Q. I was diagnosed with depression and have taken a whole host of antidepressants. I’m Mark, 29 years old male. I was diagnosed with depression and have taken a whole host of antidepressants. My eyes are extremely blurry, I’m worrying about that. Does this side effect go away with time, or is it permanent while on medications?

A. Mark, you really need to consult your doctor. I hope you're not relying totally on the Internet for medical advice. Side effects are common with most drugs, and some are more tolerable than others. "Extremely blurry" eyes seems like it could affect your driving, as cbellh47 wrote, but many other things as well.

Sometimes it does take many, many attempts to discover an anti-depressant or a combination of more than one to achieve a better mood balance. We're all chemically different and react to drugs differently. There's many options and I had to endure years of experimentation before I was satisfied, but I now have the rest of my life to appreciate what I went through.

I also used the help of different doctors and psychiatrists, as well as self-learning. If your doctor doesn't seem to be beneficial, consider asking him/her to recommend a specialist. New treatments come to light regularly and not all docotrs are wise to them.

Just yesterday (01.20.09) a new, control

More discussions about host
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References in periodicals archive ?
Telco Remote host Telco computer Remote host computer ID ID type type A, B A, B Physical Physical A, B A, B Physical Virtual A, B A, B Virtual Physical A, B A, B Virtual Virtual Table 2: Fixed parameters used in NS-3.
In sum, in comparing the three connecting methods, the major advantages of the direct connection include the availability of all or most Internet resources, "true" connection between the local host and the remote host, whether transfer of files can be done in the background,(13) and multitasking.
For example, the agent manager sends agents to remote hosts and receives agents for execution on the local host.
The worm then tried to infect the remote host by establishing a connection to the SMTP port and mailing an infection, as in step 2(b).
The campaign stop was at the Ogden-Hinckley Airport with a live radio remote hosted by KZHT-FM.
Readers learn tips from their first keystrokes to writing full problems in Bash, the most popular Linux shell, with chapters covering everything from secure communications with remote hosts to a history of printing, compiling programs, and validating input with Linux.
It also links to additional tools, such as for blocking hosts, ending network processes, scanning remote hosts, and more.
The TSM describes an automated Application & Services Management capability needed to monitor the performance of end-user applications, remote hosted applications or web-based services, discovery, storage, operating systems, prioritize information flow or services, and other similar functions associated with operating a modern information technology infrastructure.
The remote hosts appear as a single point code to the signaling system 7 (SS7) network, which conserves number resources and simplifies administration and routing.
"X-Admin32 eliminates the need to teach Windows users how to set up sessions on remote hosts. End users without any prior knowledge of UNIX or Linux can now instantly work productively with X Windows-based applications."

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