talc

Definition of talc

talc: A mist or powdered form of the mineral magnesium silicate that is used to prevent malignant pleural effusions from coming back. Malignant pleural effusion is a condition in which cancer causes an abnormal collection of fluid in the space between the lung and chest wall. When talc is given through a tube inserted into the pleural space, it causes the space to close up so fluid cannot collect there. Talc is a type of sclerosing agent. Also called Sclerosol Intrapleural Aerosol, Sterile Talc Powder, and Steritalc.

Source: NCI Dictionary of Cancer Terms