| Noun | 1. | talcum - a fine grained mineral having a soft soapy feel and consisting of hydrated magnesium silicate; used in a variety of products including talcum powdertalcum powder, talcum - a toilet powder made of purified talc and usually scented; absorbs excess moisture mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition soaprock, soap-rock, soapstone, steatite - a soft heavy compact variety of talc having a soapy feel; used to make hearths and tabletops and ornaments French chalk - a soft white compact talc used to mark cloth or to remove grease stains rensselaerite - a kind of soft talc; sometimes used as wood filler |
| 2. | talcum - a toilet powder made of purified talc and usually scented; absorbs excess moisturebath powder, dusting powder, toilet powder - a fine powder for spreading on the body (as after bathing) |