toothed (adj)

Sawing is a material-removal and separation process in which a toothed tool (saw) is used to cut or notch solid workpieces with a narrow cut width.

Broaching is a machining process used to produce inner and outer profiles, whereby a multi-toothed tool removes material from the workpiece.

Brügger's toothed gear model (interplay of pelvic tilt, torso elevation and elongation of the cervical spine) clearly shows how the spine can be kept straight by using an appropriate chair.