This family contains buckwheat, sorrel (but not wood sorrel[?]), rhubarb, and knotgrass[?]. It is named for the shape of the seed; that of rhubarb, for example, has a triangular cross-section.
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Urethra
In anatomy, the urethra is a tube that connects the urinary bladder to the outside of the body. The urethra has an excretory function in both ...