This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Any of a series of projections on a shaft that fit into slots on a corresponding shaft, enabling both to rotate together.

n. The groove or slot for such a projection.

n. A flexible piece of wood, hard rubber, or metal used in drawing curves.

n. A wooden or metal strip; a slat.

n. A rectangular piece that fits grooves like key seats in a hub and a shaft, so that while the one may slide endwise on the other, both must revolve together.

n. A flexible strip of metal or other material, that may be bent into a curve and used in a similar manner to a ruler to draw smooth curves between points.

n. Any of a number of smooth curves used to join points.

n. A strip of wood or other material inserted into grooves in each of two pieces of wood to provide additional surface for gluing.

v. To smooth (a curve or surface) by means of a spline.

v. To fit with a spline.

v. To fasten to or together with a spline.

n. A rectangular piece fitting grooves like key seats in a hub and a shaft, so that while the one may slide endwise on the other, both must revolve together; a feather; also, sometimes, a groove to receive such a rectangular piece.

n. A long, flexble piece of wood sometimes used as a ruler.

n. In machinery, a rectangular piece or key fitting into a groove in the hub of a wheel, and a similar groove in a shaft, so that, while the wheel may slide endwise on the shaft, both must revolve together. See cut under paint-mill.

n. A flexible strip of wood or hard rubber used by draftsmen in laying out broad sweeping curves, especially in railroad work.

To fit with a spline.

n. In building, a thin piece of board, especially when used under certain conditions, as in light and thin ceiling, the filling of large panels like the backs of seats in a church, or the curved outer shell of the centering for an arch.

n. a thin strip (wood or metal)

n. a flexible strip (wood or rubber) used in drawing curved lines

"(The word spline is often incorrectly used for this.)"

splined    splines    splining   

strip   

feather-tongue spline    French curve   

B-spline    cubic spline    splined   

feather   

steepest-descent    sinc    trigonometric    nonemergency    shipmentsof    decimeter    watermarking    inadmissibility    ephemeris    ensemble-average