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(biology) a narrowing or constriction of a vessel or canal; especially a congenital narrowing of the aorta
the property possessed by a shape that narrows toward a point (as a wedge or cone)
bottleneck, chokepoint, constriction
a narrowing that reduces the flow through a channel
the property of a shape that tapers to a sharp tip
the property of having only a dull tip (if any)