trigone

One of the thickenings of the cell wall at the angles where several cells join.
A smooth triangular area on the inner surface of the bladder, bounded by the apertures of the ureters and urethra; a similar region of a mitral valve

From French trigone, from Latin trigōnum, from Ancient Greek τρῐ́γωνον (trĭ́gōnon). Doublet of trigon and trigonon.

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