splint
noun
a thin piece of wood or other rigid material used to immobilize a fractured or dislocated bone, or to maintain any part of the body in a fixed position.
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Two long, narrow, splintlike bones covered on one surface with granular teeth are interpreted as ectopterygoids.
From A New Genus of Pennsylvania Fish (Crossoperygii, Coelacanthiformes) from Kansas by Joan Echols