flow line
nounDefinition 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