A cyborg (short for "cybernetic organism") is a being with both organic and biomechatronic parts. See for example biomaterials, bionics, and biomechatronics. 

Overview :

According to some definitions of the term, the physical attachments humanity has with even the most basic technologies have already made them cyborgs. In a typical example, a human with an artificial cardiac pacemaker or implantable cardioverter-defibrillator would be considered a cyborg, since these devices measure voltage potentials in the body, perform signal processing, and can deliver electrical stimuli, using this synthetic feedback mechanism to keep that person alive. Implants, especially cochlear implants, that combine mechanical modification with any kind of feedback response are also cyborg enhancements. Some theorists cite such modifications as contact lenses, hearing aids, or intraocular lenses as examples of fitting humans with technology to enhance their biological capabilities; however, these modifications are as cybernetic as a pen or a wooden leg.