Main Entry: ¹stream·line

Pronunciation: \ˈstrēm-ˌlīn\

Function: noun

Date: 1868

1 : the path of a particle in a fluid relative to a solid body past which the fluid is moving in smooth flow without turbulence
2 a : a contour designed to minimize resistance to motion through a fluid (as air) b : a smooth or flowing line designed as if for decreasing air resistance