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

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n. The bringing together of two parts to form a seamless whole; used especially of a dislocated joint or a broken bone

n. The adaptation or adjustment of parts to each other, as of a broken bone or dislocated joint.

n. The adaptation or adjustment of parts to one another.

n. In surgery, the act of placing the broken extremities of a bone in their natural position, or of restoring a luxated bone to its place; bone-setting.

n. In anatomy, a kind of gliding articulation of one bone with another, as that of the patella with the femur.

"In other words, the operator, grasping the limb below the fracture, draws it down or away from the trunk, while he seeks not to draw away, but simply to hold the upper portion still until the broken ends of bone are brought to their natural relative positions, when the coaptation, which is thus effected, has only to be made permanent by the proper dressings to perfect the reduction."

coaptation splint