n. & v.
n. 1 talcum powder. 2 any crystalline form of magnesium silicate that occurs in soft flat plates, usu. white or pale green in colour and used as a lubricator etc.
v.tr. (talcked, talcking) treat (a surface) with talc to lubricate or dry it. talcose adj. talcous adj. talcy adj. (in sense 1).
[ F talc or med.L talcum, f. Arab. talk f. Pers. talk ]