flow·​back | \ ˈflō-ˌbak How to pronounce flowback (audio) \

Definition of flowback

: liquid used in fracking that returns to the surface after being injected into shale The drillers then shoot millions of gallons of highly pressurized water, mixed with sand and small amounts of additives known as fracking chemicals, down the well, widening the shale fractures. Natural pressure forces the liquids back up the well, producing what's known as flowback, and the gas rushes from the fractures into the pipe.— Bryan Walsh Methane within the shale diffuses into these fissures and flows up the well. Along with the gas comes flowback water, which contains fracking fluid and additional water found naturally in the rock.— Rachel Ehrenberg

First Known Use of flowback

1956, in the meaning defined above

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The first known use of flowback was in 1956

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of or relating to the heavens

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