Category: O
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Opisthorchis sinensis
A species common throughout Asia, acquired by humans who eat poorly cooked fish that contains the larval forms. O. sinensis is a relatively uncommon cause of biliary obstruction in Western nations.
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Opisthognathism
A skull abnormality marked by a receding lower jaw.
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Opisthoglyphous
Rear-fanged or grooved; said of certain mildly venomous snakes with fangs in the upper posterior portion of their oral cavity.
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Opisthion
The craniometric point at the middle of the lower border of the foramen magnum.
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Opiate receptor
A specific site on a cell surface that interacts in a highly selective fashion with opiate drugs. These receptors mediate the major known pharmacological actions and side effects of opiates and the functions of the endogenous opiate-like substances — endorphins and enkephalins,
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Ophthalmoplegia totalis
Paralysis that affects both internal and external ocular muscles.
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Ophthalmoplegia progressiva
Ocular muscle paralysis in which all the muscles become involved slowly due to deterioration of the motor nerve nuclei.
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Ophthalmoplegia partialis
Incomplete paralysis involving only one or two of the ocular muscles.
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Ophthalmoneuritis
Inflammation of the optic nerve.
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Ophthalmomyotomy
Surgical section of the muscles of the eyes.