Wood panel comprising a groove of which - the end walls, which join the opposite walls, comprise in each case a cylindrical segment - which merges either tangentially into the other cylindrical segment or - which merges tangentially into a base plane in the centre of the groove, which has the same groove width as the end walls, and the groove is sealed by a wood patch, of which the form is approximately complementary to the groove and the two opposite end faces of the wood patch are cylindrical segments, - of which the radius is approximately equal to the end walls of the groove, which are also cylindrical segmental in form, wherein - the opening of the groove is a rectangle and - In which the two opposite walls are flat and parallel to one another and - those two side faces of the wood patch, which are contiguous with the end faces and lie opposite one another, consist in each case of a conical segment, which has the same centre axis as the end faces, which are in each case contiguous, characterised in that - the end width of the wood patch is smaller than the groove width by the indentation and - the side faces, before their introduction into the groove, project, at the patch surface, beyond the groove width by the convexity. - the end walls, which join the opposite walls, comprise in each case a cylindrical segment - which merges either tangentially into the other cylindrical segment or - which merges tangentially into a base plane in the centre of the groove, which has the same groove width as the end walls, and the groove is sealed by a wood patch, of which the form is approximately complementary to the groove and the two opposite end faces of the wood patch are cylindrical segments, - of which the radius is approximately equal to the end walls of the groove, which are also cylindrical segmental in form, wherein - the opening of the groove is a rectangle and - In which the two opposite walls are flat and parallel to one another and - those two side faces of the wood patch, which are contiguous with the end faces and lie opposite one another, consist in each case of a conical segment, which has the same centre axis as the end faces, which are in each case contiguous, characterised in that - the end width of the wood patch is smaller than the groove width by the indentation and - the side faces, before their introduction into the groove, project, at the patch surface, beyond the groove width by the convexity. - which merges either tangentially into the other cylindrical segment or - which merges tangentially into a base plane in the centre of the groove, which has the same groove width as the end walls, and - of which the radius is approximately equal to the end walls of the groove, which are also cylindrical segmental in form, wherein - the opening of the groove is a rectangle and - In which the two opposite walls are flat and parallel to one another and - those two side faces of the wood patch, which are contiguous with the end faces and lie opposite one another, consist in each case of a conical segment, which has the same centre axis as the end faces, which are in each case contiguous, characterised in that - the end width of the wood patch is smaller than the groove width by the indentation and - the side faces, before their introduction into the groove, project, at the patch surface, beyond the groove width by the convexity. - the end width of the wood patch is smaller than the groove width by the indentation and - the side faces, before their introduction into the groove, project, at the patch surface, beyond the groove width by the convexity.