Something that reinforces.

present participle of reinforce

Third-person singular simple present indicative form of reinforce

extra help or support that makes something stronger

to make something stronger or support it more

plural of reinforced concrete

A building material made from Portland cement concrete with a matrix of steel bars or wires (rebars) to increase its tensile strength.

A composite material of fiberglass (or other fibre) in a polymer matrix

plural of fibre-reinforced plastic

The giving of encouragement to a person who exhibits a particular behaviour with the result that such behaviour is repeated.