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spline (n.)

long, thin piece of wood or metal, 1756, from East Anglian dialect, of uncertain origin. Perhaps from older Danish splind or North Frisian splinj. Especially one fitted into a groove on a wheel and a shaft to keep them revolving together (1864).

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Definitions of spline from WordNet

spline (n.)
a flexible strip (wood or rubber) used in drawing curved lines;
spline (n.)
a thin strip (wood or metal);
Synonyms: slat
From wordnet.princeton.edu