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1. To render active.
2. To make radioactive.
Farlex Partner Medical Dictionary © Farlex 2012


tr.v. acti·vated, acti·vating, acti·vates
1. To set in motion; make active or more active.
2. Biology To convert (certain biological compounds) into biologically active derivatives.

ac′ti·va′tion n.
ac′ti·va′tor n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


(1) To render something active.
(2) To make something radioactive.
Chemistry To convert a compound—e.g., a provitamin or enzyme—into an active form or different compound, in particular one that has a specific biologic action
Example, activation by UV light Ergosterol, lumisterol, tachysterol, vitamin D2
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


1. To render active.
2. To make radioactive.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about activate

Q. Are there any nice activities for adults with autism? I've been helping a very nice man of 45 of years old and I'm looking for some new things I can do with him in our time together. any ideas?

A. Autistic people react wonderfully with animals. for instance- i saw a group of severe Autistic teenagers going to swim with dolphins. the effect was amazing! taking him to the zoo, or even to the park to feed ducks, pet dogs, whatever.. could have a great effect on him.
hope i helped!
tell me how it went.

Q. what is a passive smoking? and is it dangerous as an active?

A. Passive smoking is the exposure to cigarettes smoke emitted from cigarettes smoke by other person. It's dangerous and may increase the risk to several diseases similar to active smoking (one's exposure to smoke emitted from the cigarettes he or she is smoking) although the risk is of lower magnitude. Example for passive smoking is children of smokers etc.

You may read more here:

Q. i swim a lot ! what are the advantages of swimming over other sport activities? on what part of the body does it work the most ?

A. its a good workout but your not really going to burn as much calories as a regular work out.

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References in periodicals archive ?
Manufactured in carbon or stainless steel, making the equipment easy to wash down for applications like food processing and beverage bottling, Spiroflow's bin activator is designed to minimise risk in potentially hazardous or explosive environments.
Thereafter, a drop of the sample was placed on a glass slide and mixed with the activator solution (0.5mL).
Birkebaek, Melsen, and Terp [9] in an implant study that featured laminographs of the temporo-mandibular joint, concluded that the major effects of activator treatment were an increased amount of condylar growth and a remodeling of the articular fossa.
Loskutoff, "Endothelial cells produce a latent inhibitor of plasminogen activators that can be activated by denaturants," The Journal of Biological Chemistry, vol.
In the fibrinolytic system, plasminogen activators, tissue-type plasminogen activator (t-PA), and urokinase-type plasminogen activator (u-PA) are responsible for the conversion of the abundant extracellular zymogen plasminogen into the active proteinase plasmin, the key enzyme of fibrinolysis [10].
52-53 of the November issue), Honigfort said that, in emergent situations, it is permissible to pour over gel SST into a lithium heparin tube, because clot activators are not considered additives.
An apparent conflict exists between observational studies that suggest that vitamin D receptor (VDR) activators provide a survival advantage for patients with ESRD and other studies that suggest that they cause vascular calcification.
The last two chapters discuss the commercial development of plant defense activators and their practical utility in the field, highlighting the limitations in application of these activators and the precision application technology required for maximum benefit.
PAION has initiated early-stage development activities for a series of plasminogen activators and analogues that make use of the exciting pre-clinical findings of Desmoteplase.
Bag activators loosen compacted materials and promote emptying.