Definition of "trigone" [tri•gone]

• Thickenings of the cell wall at the angles where several cells join. (noun)
• A smooth triangular area on the inner surface of the bladder, bounded by the apertures of the ureters and urethra. (noun)

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• "An aperture of entry still open existed in the centre of the anterior wall of the bladder, and a patent exit opening at the base of the trigone."
• "In Fig. 1, which shows the healthy state of the neck of the bladder, unmarked by the prominent lines which are said to bound the space named "trigone vesical," or by those which indicate the position of the "muscles of the ureters," the third lobe does not exist."
• "Behind the trigone a depression called "bas fond" is formed in the base of the bladder."