talcum Definition

1. geol.
A white, green or grey mineral form of magnesium silicate, one of the softest minerals, used in talcum powder and other cosmetics, in French chalk, lubricants and paper coatings, and as a filler in paints, plastics and rubber.
2. talcum powder.

1. A fine, often perfumed, powder made from purified talc, used on the body. Often shortened to talc.