• WordNet 3.6
    • n urethra duct through which urine is discharged in most mammals and which serves as the male genital duct
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Webster's Revised Unabridged Dictionary
    • n Urethra (Anat) The canal by which the urine is conducted from the bladder and discharged.
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Century Dictionary and Cyclopedia
    • n urethra A modification of a part of a urogenital sinus into a tube or a groove for the discharge of the secretion of the genital or urinary organs, or both; in most mammals, including man, a complete tube from the bladder to the exterior, conveying urine and semen in the male sex, urine only in the female; in some birds, a penial groove for the conveyance of semen only. The urethra of the male is always a part of the penis, or a penial urethra, continuous usually with the urethral part of the urogenital sinus; that of the female is only exceptionally a part of the clitoris. In man the urethra extends from the neck of the bladder to the end of the penis, usually a distance of 8 or 9 inches. It is divided into three sections. The prostatic is that first section of the urethra which is embraced by the prostatic gland, 1 ¼ inches long, somewhat fusiform; npon its floor is a longitudinal ridge, the veru montanum or caput gallinaginis, on each side of which is a depression, the prostatic sinus, perforated by openings of the prostatic ducts. In advance of the veru is a median depression or cul-de-sac, variously known as the vesicula prostatica, vagina masculina, sinus pocularis, uterus masculinus, etc.; and the orifices of the ejaculatory ducts of the seminal vesicles open here. The membranous is that second section of the urethra, about ¾ inch long, which extends from the prostatic gland to the corpus spongiosum; it is contracted in caliber, perforates the deep perineal fascia, and is embraced by layers reflected from this fascia and by the specialized compressor urethræ muscle. The spongy section of the urethra extends from the membranous section to the end of the penis, being all that part of the urethra which is embraced by the penial corpus spongiosum. It is dilated at its beginning—this dilatation being sometimes specified as the bulbous section of the urethra, and further marked by the opening of the ducts of Cowper's glands—and at its end, within the glans penis, this terminal enlargement being the fossa navicularis. The urethra ends in a narrow vertical slit, the meatus urinarius. Numerous submucous follicles, the glands of Littrė, open into the spongy section of the urethra; one of these openings forms a recess of considerable size, the lacuna magna. The substance of the urethra includes mucous, muscular, and erectile tissue. In the female the urethra is very short, about 1½ inches in length, and much more simple in structure and relations than that of the male.
    • n urethra the penis of any animal; in man, the spongy urethra.
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Chambers's Twentieth Century Dictionary
    • n Urethra ū-rē′thra the canal by which the urine is discharged from the bladder
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Webster's Revised Unabridged Dictionary
L., fr. Gr. . See Urine
Chambers's Twentieth Century Dictionary
Gr.,—ouron, urine.


In literature:

From the middle of the penis up to the symphysis only the lower wall of the urethra was split.
"Anomalies and Curiosities of Medicine" by George M. Gould
Below those nervous bodies is the urethra, and whenever they swell, it swells also.
"The Works of Aristotle the Famous Philosopher" by Anonymous
"Searchlights on Health" by B. G. Jefferis and J. L. Nichols
It comes from the small glands of Littre and Cowper which open into the urethra.
"Studies in the Psychology of Sex, Volume 5 (of 6)" by Havelock Ellis
The canal of the urethra leading into the bladder.
"Disease and Its Causes" by William Thomas Councilman
In men it may even occur inside the canal through which the urine passes (urethra).
"The Third Great Plague" by John H. Stokes
Further back is the urethra, or water passage, which is one and a half inches long.
"The People's Common Sense Medical Adviser in Plain English" by R. V. Pierce
In women the urethra is a separate canal from the vagina, and the urethra is very frequently not affected in gonorrhea.
"Woman" by William J. Robinson
The urethra opened apparently into the anterior wall of the rectum.
"History of Circumcision from the Earliest Times to the Present" by Peter Charles Remondino
"Searchlights on Health: Light on Dark Corners" by B.G. Jefferis

In news:

Their babies were lodged in their narrow birth canals, and the resulting pressure cut off blood to vital tissues and ripped holes in their bowels or urethras, or both.
Instead, one of the eels meant to eat the man's dead skin cells decided to enter his penis through the urethra.
Johnson & Johnson (JNJ JNJ) 's vaginal sling, used to support the urethra after surgery to treat weakened pelvic muscles, cuts in half a women's risk of subsequently developing incontinence , a study found.
The prostate gland is an organ that surrounds the urinary urethra in men.
The urethra carries urine from the bladder and sperm from the testes to the penis.
Urinary continence is maintained by a muscular sphincter that surrounds the urethra as it exits the bladder.
Due to the nature of the male anatomy, males can get blocked a lot easier than females because they have a very long thin urethra (the tube from the bladder to the penis) that carries urine.
An ECG was also started and attempts to unblock his urethra were made.
Urethritis (YUR-a-THRYT-is) is the inflammation of the urethra (you-REE-thruh), which is the tube that carries urine from the bladder to the outside of your body.
The vas deferens are thin muscular tubes that carry sperm from each testicle to the urethra.
The prostate gland is a male sex organ located below the bladder and around the urethra.
Lou Dobbs on Fox Business has already started being a Brobdingnagian urethra about this movie, which he quickly condemned as "insidious nonsense from Hollywood".
Metro UK explains in graphic detail how one excited eel ended up in Zhang Nan's bladder after taking the scenic route through his urethra.
Prostate cancer affects the prostate , a walnut-size gland in men that surrounds the urethra and normally helps produce seminal fluid.
The prostate gland is situated directly under the bladder and envelops the prostatic urethra and the ductus ejaculatorii.

In science:

It has to be visible for patients and this is why the procedure described below was adopted. A probe is inserted into the patient’s urethra and retained for the MRI examination as well as the implantation procedure the next day. This allows for urethra visibility in both MRI data and TRUS images.
MRI/TRUS data fusion for prostate brachytherapy. Preliminary results
The urethra position (lumen centre) is recorded in the TRUS and MRI components for every bi-modality image (see figure 3).
MRI/TRUS data fusion for prostate brachytherapy. Preliminary results
The urethra match measurements on bi-modality images after registration are presented in the following table. These values correspond to the 11 bi-modality computed images of the phantom.
MRI/TRUS data fusion for prostate brachytherapy. Preliminary results
Please note that the phantom urethra diameter is about 10mm.
MRI/TRUS data fusion for prostate brachytherapy. Preliminary results
The verification on urethra (lumen centre) is reported in table IV for 4 out of these 11 patients.
MRI/TRUS data fusion for prostate brachytherapy. Preliminary results