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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 ?
The occurrence of the boundary layer separation greatly reduces the effective smoke exhausting area of the vertical shaft and the natural ventilation effectiveness.
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 RSF automatic window control strategy began as a simple night purging sequence, then evolved into a twenty-four-hour natural ventilation scheme.
The influence of porous screens on natural ventilation in a dwelling unit.
Natural ventilation is an option that allows occupants to breathe unfiltered outdoor air when outside conditions are optimal.
The 43-classroom and laboratory facility promotes a healthy learning environment through balanced daylight, natural ventilation, engineered acoustics, efficient building systems and sustainable materials.
Inlets on the NW facade supply outdoor air to floors 2 and 4-9 when the natural ventilation system is in operation.
MONROE, Ohio, June 19, 2013 /PRNewswire/ -- Deceuninck North America, a leading designer and manufacturer of high-quality systems for windows, doors, and outdoor living; has formed a marketing partnership with RENSON Ventilation NV, a trendsetter in natural ventilation and sun protection, to add even greater value to Deceuninck's high-quality, energy-efficient vinyl windows for commercial applications.
This is evident when making decisions on integrating HVAC systems with natural ventilation via operable windows and window management procedures.
Openable windows assist with natural ventilation, and hot air is dissipated at high outlets through the stack effect.
Collections will be stored in conditions needed to ensure their preservation with a special, low-energy design where natural ventilation and the building structure help ensure the necessary environment.