Medical Dictionary Terms Beginning with P

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Parathyroid

Parathyroid: Gland that regulates calcium, located behind the thyroid gland in the neck. The parathyroid secretes a hormone called parathormone (or parathyrin) that is critical to calcium and phosphorus metabolism. Although the number of parathyroid gl
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Parathyroid hormone

Parathyroid hormone: See Parathormone.
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Parathyroids, hypoplasia of the thymusand

Parathyroids, hypoplasia of the thymusand: Also known as the DiGeorge syndrome (DGS), this disorder is characterized by (1) low blood calcium levels (hypocalcemia) due to underdevelopment (hypoplasia) of the parathyroid glands which control calcium; (2
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Parenteral

Parenteral: Not enteric (by the intestine). Something given by injection is parenteral.
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Parenteral nutrition

Parenteral nutrition: Intravenous feeding. Same as parenteral alimentation.
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Paresis

Paresis: Incomplete paralysis.
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Paresis, general

Paresis, general: A part of late (&tertiary&) syphilis a decade or more after the initial infection, due to chronic inflammation of the covering and substance of the brain (meningoencephalitis) which results in progressive dementia and genera
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Paresthesia

Paresthesia: An abnormal sensation of the body, such as numbness, tingling, or burning.
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Parietal bone

Parietal bone: The side bone of the skull.
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Parietal lobe

Parietal lobe: Part of the brain and specifically a section of thecerebral hemisphere.
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Parkinson's disease

Parkinson's disease: Parkinson's disease is an abnormal condition of the nervous system caused by degeneration of an area of the brain called the basal ganglia. The disease results in rigidity of the muscles, slow body movement and tremor. Parkinson's
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Parotid gland

Parotid gland: The largest of the three major salivary glands, it is located in front and below the ear and behind the jaw bone. The other two glands are the submandibular (submaxillary) and sublingual.
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Parotids

Parotids: Salivary glands situated in front of the ears.
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Parotitis

Parotitis: Inflammation of the parotid glands. A classic feature of mumps.
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Paroxysmal atrial tachycardia (PAT)

Paroxysmal atrial tachycardia (PAT): Bouts of rapid, regular heart beating originating in the atrium (upper chamber of the heart). Due to abnormalities in the AV node &relay station& that lead to rapid firing of electrical impulses from the a
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Parrot fever (psittacosis)

Parrot fever (psittacosis): An infectious disease due to a bacteria (Chlamydia psittaci) contracted from psittacine birds, especially caged birds like parrots but also in turkey processing plants. The name psittacosis comes from the Greek &psittak
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Parry’s disease

Parry’s disease: Toxic multinodular goiter. Named for the English physician Caleb Hillier Parry (1755-1822). also called Plummer’s disease.
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Parthenogenesis

Parthenogenesis: Development of a germ cell without fertilization. This is what happens in the formation of some benign ovarian tumors called dermoids (ovarian teratomas). The term &parthenogenesis& comes from the Greek &parthenos&
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Partial hysterectomy

Partial hysterectomy: In a partial hysterectomy, the uterus is surgically removed but the cervix is left in place. Also called a subtotal hysterectomy.
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Partial syndactyly

Partial syndactyly: Fingers or toes are partially joined together. Syndactyly can involve the bones or just the skin. With partial syndactyly, the connection extends from the base only part way up the involved digits. The word ôsyndactylyö is c
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