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1. The study and description of organisms and natural objects, especially their origins, evolution, and interrelationships.
a. A collection of facts about the development of a natural process or entity: the natural history of tuberculosis.
b. A work or treatise containing such facts.
Natural HistoryHerbal medicine
A 37-volume collection of works on plants written by Pliny (the Elder) of the Greek empire, which served as a source of information for herbalists until the 17th century.
natural history (of disease)
The expected or predictable course of an untreated illness. The knowledge of the expected course of a disease is usually based on prior study of the effects of the illness on a large group of patients over time.See: disease progression
See also: history
occurs in nature, without the intervention of humans.
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.
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.
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.
selection occurring in nature, without any human intervention, direct or indirect.
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.