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(prĕg′nān) C21H36; the organic compound that is a precursor of two series of steroid hormones: the progesterones and several adrenal cortical hormones.


(prĕg″nān-dī′ŏl) C21H36O2; the inactive end product of metabolism of progesterone present in the urine. The amount in the urine increases during the premenstrual or luteal phase of the menstrual cycle and during pregnancy.


(prĕg″nān-trī′ŏl) A metabolite of progesterone. Its presence in the urine is increased in those who have congenital adrenal hyperplasia.


(prĕg′nănt) [L. praegnans] Having conceived; with child. SYN: gravid.


(prĕg′nēn) A steroid that forms the nucleus of progesterone.


(prē″hă-bil″ĭ-tā′ shŏn)

The use of rehabilitative methods to prevent disease, functional impairment, or injury before it occurs.


(prē-hĕn′sĭl) [L. prehendere, to seize] Adapted for grasping or holding, esp. by encircling an object.


(prē-hĕn′shŭn) [L. prehensio] The primary function of the hand; includes pinching, grasping, and seizing.

Prehn sign

(prān, prēn) [Douglas T. Prehn, U.S. physician, 1902–1974] A decrease in scrotal pain with elevation of the testicle. It is a physical finding in patients with epididymitis, but not testicular torsion.


(prē″hawr′mōn″) A precursor of a hormone.

prehospital care report

ABBR: PCR. Run sheet.


(prē″hī″pĕr-ten′ chĭn) [pre- + hypertension] Having a systolic blood pressure between 120 and 139 mm Hg and/or a diastolic blood pressure between 80 and 89 mm Hg. People with prehypertension have a very slightly increased risk for strokes, heart attacks, and kidney failure relative to those whose blood pressure is below 120/80. SYN: early hypertension.


(prē-ĭk′tăl) [″ + ictus, stroke] The period just prior to a stroke or convulsion.


(prē-ĭm″ū-nĭ-zā′ shŭn) [″ + immunis, safe] Immunization produced artificially in very young infants.


(prē″ ĭm-plăn-tā′ shŭn) Before one thing is secured within another, e.g., before embedding of the blastocyst in the uterine wall.


(prē″ĭn-vā′ sĭv) [″ + in, into, + vadere, to go] Pert. to a stage of development of a malignancy in which the neoplastic cells have not metastasized.


(pre′jŭ-dĭs) [L. praejudicium, former judgment, precedent] 1. A preconceived ...

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