(automotive) Any of several restraining systems in a vehicle, such as an airbag, in addition to the seatbelts

Capable of being supplemented.

plural of supplemental restraint system

The condition of being a supplement.

Any of various North American vines that have supple stems. / A cane made from such a plant used as a walking stick or as a whip.

(transitive) To supplement, especially in terms of grammatical suppletion.

plural of dietary supplement

plural of herbal supplement

A preparation that provides vitamins, minerals, amino acids, and other essential nutrients for a health goal or purported health benefit.

A source of supply. / A supplement.