spline noun & verb. 
[splʌɪn] M18.[Orig. East Anglian dial.: perh. rel. to SPLINTER noun.]A. noun.
1.  A long thin narrow piece of wood, metal, etc.; a slat. 
M18.b. spec. A flexible strip of wood, rubber, etc., used in drawing curves. 
L19.2.  A rectangular key fitting into grooves in the hub and shaft of a wheel etc. so as to allow movement of the wheel on the shaft; 
esp. one formed integrally with the shaft. Also, a corresponding groove in a hub along which the key may slide. 
M19.3.  Math. A continuous curve constructed so as to pass through a given set of points and have continuous first and second derivatives. Also 
spline curve. 
M20.b. verb trans. Fit or provide with a spline. 
L19.  [TahlilGaran] English Dictionary ▲