flow line

noun

Definition of flow line 

1 : distinguishable differences (as of color, texture, or arrangement of crystals) indicative of flow having taken place in a plastic solid (as an igneous rock formation or wrought metal)

2 : a pipe or gutter carrying a flow of liquid especially at zero pressure head

3 : one of several microscopic lines on the surface of a coin created by the outward flow of metal during the striking process

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