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The industry uses "frac" as the verb and an adjective and "fracing" as the deverbative adjective. It's short for "fracture", which has no "k" in it.
A frac job is performed by driving up pump pressure on a confined hydrostatic mud column, fracing into the formation, running up pump pressure to propagate the frac set, injecting proppant, and then reversing out frac fluid ("wash water" in some usages, which also applies to coproduced connate fluids during a completion job), flowing the well, and cleaning up while prep to test.
That's real industry usage.