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/nat·u·ral/ (nach´ah-r'l) neither artificial nor pathologic.

family planning, natural

methods of preventing conception without the use of artificial contraceptive means. Also called fertility awareness methods. See also contraception.


Substance abuse A substance causing euphoria and analgesia at the desired abuse levels and physical dependence and CNS depression, stupor, coma and death in excess. See Opiates.
Narcotic types
Natural Products extracted from the poppy plant, yielding morphine and heroin, or the coca plant, yielding cocaine and crack
Semi-synthetic Products with opiate activity, eg meperidine and methadone or synthetics, see MPTP; under the umbrella term of narcotic, alkaloids, eg LSD, mescaline, barbiturates, alcohol, marijuana, cocaine, hallucinogens and stimulants, eg antidepressants.
Completely synthetic Products created by synthesis alone, eg fentanyl  


occurs in nature, without the intervention of humans.

natural experiments
occur by chance when all variables for a population are constant except one, which is different for one large part of the population compared with the other, e.g. when half of a flock comes from one climate and the other half is a local resident in another climate.
natural focus
the ecology that is best suited to a biological system, e.g. an individual insect-borne disease; the area in which the disease naturally flourishes best; an ecological niche.
natural history
history of a process or organism as it occurs in nature, e.g. course of a disease from infection to resolution.
natural killer (NK) cell
see natural killer cell.
natural selection
selection occurring in nature, without any human intervention, direct or indirect.
natural ventilation
ventilation without the use of artificially induced energy and the machines which it drives; the forces used are wind and the exchange of heat from within the barn and the external air, controlled by ventilation devices in the walls and the ceiling.

Patient discussion about natural

Q. What is the best natural cure for migraines? Every day I hear something else... would love it if you can share your experience...I'm sick of chemicals:)

A. stay off any products that have a any kind of a caffine content, including chocolate. try this for 3wks, ypu should notice a difference

Q. Is there a recommended natural cure for graves disease? I've been suffering from graves for a year now and really feel tired of it. I'm thinking of trying some natural medications cause the regular ones are dissapointing so far. Any experience with that??

A. I am not familiar with any natural supplements you can take for graves disease, furthermore, it is an illness where you should be on close monitoring of an endocrinologist, and have them tell you which medications you are allowed to take and what could make the situation worse. If regular treatment doesn't seem to help you much you should go for another check up to see how your thyroid is doing.

Q. Is there a natural cure for hpv?

More discussions about natural
References in periodicals archive ?
While emergency functionality was a significant consideration for Royal Jubilee's PCC, a LEED Gold-certified medical, surgical, and mental health inpatient facility designed by CannonDesign (former Vancouver, British Columbia, office), the primary goal in incorporating natural ventilation was to create a more patient-centric environment, says David Leadbetter, Royal Jubilee's director of special projects.
Other buildings the client operated had geothermal wells, composting toilets and used natural ventilation, so they were very familiar with and comfortable operating and maintaining these systems.
architectural guidelines allow the use of operable windows and require consideration of natural ventilation as a means of energy savings where conditions permit (FGI 2014).
Hence, more explorations should be conducted to preserve the aesthetic heritage of the wood carving panels, which at the same time provides effective natural ventilation.
In this context, energy is needed to optimize drying, as well as optimal conditions for mass exchange; in the case of naturally ventilated solar dryer of coffee, during the day (where there is availability of solar energy), sufficient natural ventilation area should be maintained to facilitate mass exchange (vapor water) with the purpose of increasing efficiency.
For buildings with natural ventilation, the researchers found that while fresh air could reduce sick building symptoms, it also increased the number of respiratory issues workers experienced.
To quantify the natural ventilation savings that the occupants have missed, 75F (23.
IVANOVA & VAN STADEN (2010) observed that the natural ventilation eliminated the problems with hiperhydricity in Aloe polyphylla plants.
Literature review shows that the most commonly used multizone network models for natural ventilation are COMIS (Feustel 1999) and CONTAM (Walton and Dols 2006).
The building will have a double-layered wind-pressurised facade that allows natural ventilation in all weather conditions.
In the top-floor apartments of multi-storey apartment buildings with natural ventilation the air change is typically very low.
A third architectural strategy found in early industrial buildings was their effective provision of natural ventilation in the era before air conditioning.