Answer: splined

AnswerCrossword Clue
SPLINEDProvided with a keyway
splinedfunction that has specified values at a finite number of points and is used for approximation
splinednarrow, thin strip of wood, metal, etc.
splinedto provide with a spline or keyway
splinedSPLINE, to provide with a key to make a wheel and shaft revolve
splinedrectangular key that fits in ridges on a shaft so as to transmit torque, or the ridges themselves