prostate gland

noun Anatomy.
an organ that surrounds the urethra of males at the base of the bladder, comprising a muscular portion, which controls the release of urine, and a glandular portion, which secretes an alkaline fluid that makes up part of the semen and enhances the motility and fertility of sperm.

1830–40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

prostate gland n.
A chestnut-shaped body that surrounds the beginning of the male urethra at the base of the bladder, consists of two lobes connected anteriorly by an isthmus and posteriorly by a middle lobe lying above and between the ejaculatory ducts, controls the release of urine from the bladder, and whose milky fluid secretion is discharged into the urethra during semen emission.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
prostate gland   (prŏs'tāt')  Pronunciation Key 
A gland in male mammals located at the base of the bladder. The prostate gland opens into the urethra and secretes a milky fluid that is a major component of semen.

prostatic adjective (prŏ-stāt'ĭk)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
prostate gland [(pros-tayt)]

A gland in the male reproductive system that surrounds the urethra at the lower end of the urinary bladder. A large part of the fluids that make up semen comes from the prostate.

Note: Prostate cancer is a leading cause of death among American men.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The geometry of this design allows the robot to hollow out a cavity from within
  the prostate gland.
They found no evidence of infection of the prostate gland to explain the fever.
The prostate gland is roughly the size and shape of a walnut, and encased in a
  fibrous sheath called the capsule.
Scientists have proven that a functional prostate gland can be grown from a
  single adult stem cell.
Images for prostate gland
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