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talcum (n.)

1550s, from Medieval Latin talcum, used for any of various shiny minerals. See talc. Talcum powder attested from 1871.

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Definitions of talcum from WordNet

talcum (n.)
a fine grained mineral having a soft soapy feel and consisting of hydrated magnesium silicate; used in a variety of products including talcum powder;
Synonyms: talc
talcum (n.)
a toilet powder made of purified talc and usually scented; absorbs excess moisture;
Synonyms: talcum powder
From wordnet.princeton.edu