1. talcum(n = noun.substance) talc - a fine grained mineral having a soft soapy feel and consisting of hydrated magnesium silicate; used in a variety of products including talcum powder;
is a kind of mineral
has particulars: soap-rock, soaprock, soapstone, steatite, french chalk, rensselaerite
2. talcum(n = noun.artifact) talcum powder - a toilet powder made of purified talc and usually scented; absorbs excess moisture;
is a kind of bath powder, dusting powder, toilet powder
Same as Talc. [Webster 1913 Suppl.]
talcum, n.
1 = TALC.
2 (in full talcum powder) powdered talc for toilet and cosmetic use, usu. perfumed.
Etymology:
med.L: see TALC