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22 Topic Pages Found in Health & Medicine and starting with the letter O
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Open Oats

cereal plants of the genus Avena of the family Gramineae ( grass family). Most species are annuals of moist temperate regions. The early history of


A condition in which the energy stores of the body (mainly fat) are too great. It is commonplace in prosperous countries and is increasing in

Open Obsessive-compulsive disorder
Obsessive-compulsive disorder

Obsessions and the compulsive behaviors often associated with them are symptoms of an obsessive-compulsive disorder (OCD). Like many other mental

Occupational diseases

illness incurred because of the conditions or environment of employment. Unlike with accidents, some time usually elapses between exposure to the

Ochoa, Severo, 1905-1993

Spanish-born US biochemist who was awarded a Nobel Prize for Physiology or Medicine in 1959 for the discovery of enzymes that catalyse the formation

olive oil

pale yellow to greenish oil obtained from the pulp of olives by separating the liquids from solids. Olive oil was used in the ancient world for

Open ophthalmology

( ŏf´´thălmŏl'əjē ), branch of medicine specializing in the anatomy, function and diseases of the eye . Ophthalmologists specialize in the medical and


According to the strict definition, opiates are drugs derived from opium , and opioids are opiate-like substances either made in the body—the

Opioid abuse

Following an increase in the prevalence of chronic pain and campaigns denouncing inadequate treatment of pain, the past two decades have culminated in

Open opium

substance derived by collecting and drying the milky juice in the unripe seed pods of the opium poppy , Papaver somniferum. Opium varies in color from