Noun
orthosis (plural orthoses)
(medicine) A type of brace which either prevents or assists movement of a limb or the spine.
A few examples are: powered leg prosthesis for neuromuscularly impaired, ankle-foot orthosis, biological realistic leg prosthesis and forearm prosthesis. Source: Internet
An orthosis is a wearable device that acts in parallel to the affected limb. Source: Internet
Although the initial aim of humanoid research was to build better orthosis and prosthesis for human beings, knowledge has been transferred between both disciplines. Source: Internet
The devices themselves are properly referred to as "prostheses" and "orthoses" in the plural and "prosthesis" and "orthosis" in the singular. Source: Internet